Font scale adjustment based on individual keyboards

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Is your feature request related to a problem? Please describe. I've many keyboards that I made based on different languages, but not all have same number of alphabets, some have way more, and which makes the font a bit too small, because font is scalped globally.

Describe the solution you'd like Just like how we can adjust/change settings for each keyboard like hint source, popup key order,etc it'd be nice if I can have a font scaling to adjust it for individual keyboard.

Use case So I could make font bigger for more alphabet keyboard so it's properly visible and not make font for other keyboard unbearably big.

Describe alternatives you've considered (if any) None.

Screenshot:

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Also it'd be nice to have the ability to change keyboard height individually.