It would be incredible if leads/admins could upload their own style guide or content guide (this may be internal, company specific, etc.) so that we can have more useful Assist functionality. Using this feature could align new card content with company specific standards - spellings, brand names, style suggestions, etc.
Basically, if we had more room here to train Assist, we could include more rules and style guidelines.
I suppose this is similar to what people may be doing with private GPTs today.