db.blacklist.aggregate([
  { $project: { contact: 1, profile: 1 } },
  { $match: { contact: 'SELF_ID_STR' }, // * if we not have result, pipe stay on whis step.
  // convert results to { _id: null, blocked_list: [idslist...] }
  { $group: { _id: null, blocked_list: { $push: { $toObjectId: '$profile' } } } },
  {
    $lookup: {
      from: 'profiles',
      as: 'profiles',
      let: { ignore: '$blocked_list' },
      pipeline: [
        // * cant use $nin in aggregate
        // * cant modify results for add self profile to exclude
        { $match: { $expr: { $not: { $in: ['$_id', '$$ignore'] } } } }
      ]
    }
  },
  { $unwind: '$profiles' },
  { $replaceRoot: { newRoot: '$profiles' } }
]);