db.getSiblingDB("config").chunks.aggregate([
   { $match: { ns: { $nin: ["config.system.sessions"] } } },
   { $group: { _id: { shard: "$shard", ns: "$ns" }, chunks: { $sum: 1 } } },
   { $group: { _id: "$_id.ns", data: { $push: { k: "$_id.shard", v: "$chunks" } } } },
   { $replaceRoot: { newRoot: { $mergeObjects: [{ $arrayToObject: "$data" }, { ns: "$_id" }] } } }
   { $sort: { ns: 1 } }
])

{ "shard_03" : 1794, "shard_02" : 1794, "shard_01" : 1794, "shard_04" : 1794, "ns" : "data.sessions.20210606" }
{ "shard_03" : 1509, "shard_04" : 1508, "shard_02" : 1508, "shard_01" : 1508, "ns" : "data.sessions.20210607" }
{ "shard_04" : 1912, "shard_03" : 1911, "shard_02" : 1912, "shard_01" : 1911, "ns" : "data.sessions.20210608" }
{ "shard_03" : 2019, "shard_04" : 2019, "shard_01" : 2019, "shard_02" : 2018, "ns" : "data.sessions.20210609" }
{ "shard_01" : 1977, "shard_03" : 1977, "shard_04" : 1977, "shard_02" : 1977, "ns" : "data.sessions.20210610" }
{ "shard_03" : 1300, "shard_01" : 1300, "shard_04" : 1300, "shard_02" : 1299, "ns" : "data.sessions.20210611" }
{ "shard_02" : 1841, "shard_03" : 1840, "shard_04" : 1841, "shard_01" : 1841, "ns" : "data.sessions.20210612" }
{ "shard_04" : 2030, "shard_01" : 2029, "shard_03" : 2029, "shard_02" : 2030, "ns" : "data.sessions.20210613" }
{ "shard_02" : 1496, "shard_04" : 2273, "shard_01" : 2484, "shard_03" : 1708, "ns" : "data.sessions.20210615" }
{ "shard_03" : 2841, "shard_04" : 1179, "shard_01" : 2366, "shard_02" : 1333, "ns" : "data.sessions.20210616" }
{ "shard_01" : 8156, "ns" : "data.sessions.20210617" }
{ "shard_01" : 2967, "ns" : "data.sessions.20210618" }
{ "shard_01" : 10, "ns" : "data.sessions.20210619" }
{ "shard_01" : 10, "ns" : "data.sessions.20210620" }
{ "shard_01" : 10, "ns" : "data.sessions.20210621" }
{ "shard_01" : 224, "shard_04" : 199, "shard_02" : 1170, "shard_03" : 332, "ns" : "ignored.sessions.20210615" }
{ "shard_02" : 1148, "shard_04" : 315, "shard_01" : 218, "shard_03" : 237, "ns" : "ignored.sessions.20210616" }
{ "shard_02" : 1950, "ns" : "ignored.sessions.20210617" }
{ "shard_04" : 1, "shard_02" : 845, "ns" : "ignored.sessions.20210618" }
{ "shard_02" : 10, "ns" : "ignored.sessions.20210619" }
{ "shard_02" : 10, "ns" : "ignored.sessions.20210620" }
{ "shard_02" : 10, "ns" : "ignored.sessions.20210621" }
{ "shard_02" : 139, "shard_01" : 134, "shard_04" : 127, "shard_03" : 128, "ns" : "mip.statistics" }

sh.status()--- Sharding Status --- 
  sharding version: {
  	"_id" : 1,
  	"minCompatibleVersion" : 5,
  	"currentVersion" : 6,
  	"clusterId" : ObjectId("608864f0e8dcb6218857ab2d")
  }
  shards:
        {  "_id" : "shard_01",  "host" : "shard_01/d-mipmdb-sh1-01.swi.srse.net:27018,d-mipmdb-sh2-01.swi.srse.net:27018",  "state" : 1,  "tags" : [ ] }
        {  "_id" : "shard_02",  "host" : "shard_02/d-mipmdb-sh1-02.swi.srse.net:27018,d-mipmdb-sh2-02.swi.srse.net:27018",  "state" : 1,  "tags" : [ ] }
        {  "_id" : "shard_03",  "host" : "shard_03/d-mipmdb-sh1-03.swi.srse.net:27018,d-mipmdb-sh2-03.swi.srse.net:27018",  "state" : 1,  "tags" : [ ] }
        {  "_id" : "shard_04",  "host" : "shard_04/d-mipmdb-sh1-04.swi.srse.net:27018,d-mipmdb-sh2-04.swi.srse.net:27018",  "state" : 1,  "tags" : [ ] }
  active mongoses:
        "4.4.3" : 16
        "4.4.5" : 2
  autosplit:
        Currently enabled: yes
  balancer:
        Currently enabled:  yes
        Currently running:  no
                Balancer active window is set between 02:10 and 01:50 server local time
        Collections with active migrations: 
                mip.statistics started at Fri Jun 18 2021 11:13:38 GMT+0200 (W. Europe Daylight Time)
        Failed balancer rounds in last 5 attempts:  5
        Last reported error:  Could not find host matching read preference { mode: "primary" } for set shard_01
        Time of Reported error:  Fri Jun 18 2021 10:24:32 GMT+0200 (W. Europe Daylight Time)
        Migration Results for the last 24 hours: 
                3 : Success
                1 : Failed with error 'aborted', from shard_02 to shard_04
  databases: 

       {  "_id" : "mip",  "primary" : "shard_01",  "partitioned" : true,  "version" : {  "uuid" : UUID("4c4d4777-1a9e-4fd8-9b73-f579e1b5a83a"),  "lastMod" : 1 } }
                mip.statistics
                        shard key: { "ts" : "hashed" }
                        unique: false
                        balancing: true
                        chunks:
                                shard_01	134
                                shard_02	139
                                shard_03	128
                                shard_04	127
                        too many chunks to print, use verbose if you want to force print

db.statistics.drop()

Error: drop failed: {
	"ok" : 0,
	"errmsg" : "timed out waiting for mip.statistics",
	"code" : 46,
	"codeName" : "LockBusy",
	"operationTime" : Timestamp(1624017860, 1),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1624017860, 1),
		"signature" : {
			"hash" : BinData(0,"lkY1zw1m1Zv/rqUaVsAWCkGrzjI="),
			"keyId" : NumberLong("6955920606428659733")
		}
	}
} :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
DBCollection.prototype.drop@src/mongo/shell/collection.js:713:15
@(shell):1:1