TextMeshPro Set Alpha Color

Hi

I have an outlined font that I would like to use with TMP but I don't know how to fill my text:

As you can see, only the outline is affected by the VertexColor property which is normal because only the outline is drawn in the font file.

I would like to know if there is any way to fill the "inside" of the font to achieve something like this (even if background is not white) Thanks!