Draw Text Dynamic Texture On PBR Material

Questions
4

Thank you @JohnK and @Evgeni_Popov

This is my playground link writing transparent dynamic texture to pbr material

I suppose the:

tex.drawText('TEXT', null, null, font, '#f54242', 'transparent', true, true);

will overwrite the material background color. If it is working then, it must be something that is black colored overlay my material color.

Please someone advise.