Is your feature request related to a problem?

Yes I'd like being able to switch account from MultiMC's accounts.json

Describe the solution you'd like.

Detect the .minecraft is actually a MultiMC instance and parse .....\accounts.json

Describe alternatives you've considered.

In-game account switcher but it hasn't worked for me

Agreements

• I have searched for and ensured there isn't already an open issue regarding this.
• I have ensured the feature I'm requesting isn't already in the latest supported mod version.

Other

No response

Will need to investigate the contents of this MultiMC's accounts.json to see what it contains.
I'm thinking of a new, fourth auth method that is only present if it detects the mod is running in a MultiMC context.

I use symbolic links between my MultiMC and PolyMC installs and can't recall having any issues, to give you an idea of how similar they are

I would recommend also supporting PolyMC. You probably wouldn't have to do any extra work, but there is a small chance a file / directory might be named differently in PolyMC.