Is your feature request related to a problem? Please describe.
Able to change file names would be game changer. I am referring to like
You can have a custom jem file name for easier management
For example
Allay_hat.jem
...

Ex. It would be really great for managing and arranging jem files instead of opening all of them to find one or set up a txt file for that you can just rename it to a custom name

Describe the solution you'd like
Now for identify
You can set up a lang file
Or make the allay folder to have a line of code that allows that
If that makes sense.

Does OptiFine do this
No optifine does not allow it

Additional context
For context
Assets/minecraft/emf/cem/allay/
Allay_hat.jem
Allay_cowboy.jem
........

This will not be something i'll add,

cons:

• there is no end user benefit.
• this would require a fundamental rework of how ETF and EMF variate things.
• breaks OptiFine backwards compatibility where it doesnt need to
• numbers are simpler than full custom names, and also immedeately make clear that a model has variation to others looking at your pack files
• numbers inherently make the variants group up in the file system when sorting by name
• .jpm files atleast partially provide this functionality
• requires extra files and features to map model names to their renames
• would need to keep back compatibility with the number system anyway and most people will still only use that for many of the above reasons

pros:
pack devs can have more descriptive model file names that no one else will ever see