Amazfit Watch faces

It depends on which elements should change themes.

I have a sort of bicolor watch, with some elements being in white and some others in an accent color. I'd like to switch between various accent colors.
Using code, you can easily add multiple themes or multiple languages to the watch face ...

Is there a way to bundle various themes and/or languages into one watchface?
The idea would be to provide more assets and edit the files to achieve the following:

For languages, the watch would choose the active language, if possible, otherwise English by default.
For themes, the watch would let ...