Is there a way to make this sdk supported directly by Unity?

I’m going to create an app that allows you to use a custom native keyboard at Unity.
I want to set a theme or add a specific button to the native keyboard of Android or iPhone.
Is this possible with keyman?

Hi @Cockcrow, welcome to the community!

There is no way to alter the native (or system-supplied) keyboard of Android and iPhone. Instead, these platforms provide for 3rd party keyboards that completely replace the system-supplied keyboard. Keyman is one of these 3rd party keyboard apps; with it you can build a keyboard that is used either in-app or system-wide, as you prefer. The details of integration differ between iOS and Android, but you can use the same keyboard design on both.