Name of default fonts

To support some older and smaller devices in my watchface, I want to add a custom font.

Can someone tell me what the name of the default font is? Like e.g. Graphics.FONT_XTINY - which font is used in this case? (I'm talking about the font name like e.g. Roboto)

If those fonts are different on different watches, maybe someone can tell me which font the Fenix 6X uses?