Allow changing text fill and outline color in a mogrt?

I'm making a mogrt in AE involving user-supplied text. "user" mean the person using the mogrt in premiere, who is also myself.

In essential graphics panel in AE, before exporting the mogrt, I can choose to allow font, style, size, and faux style to be changed by the user.

How can I also permit changing fill color, outline color, outline width, etc?

This mogrt takes a line of text and performs an animation on it. To make it more general purpose, I want the user to be able to change as many text properties as possible.