Look at mongo-hacker, one of the most popular .mongorc.js implementations to assess:

• the level of compatibility with mongosh;
• whether it has features that enhance the experience that we want to build natively into mongosh in the future.

Timebox: 2 days

Expected outcome: a list of interesting features it adds on top of the legacy mongo shell that we can consider as candidates to improve the UX with mongosh. If we find that it (almost) just works with mongosh that's great too but realistically I find that unlikely.