Color background inside glyph?

In this glyph, I need to set the background of the inner portion to white so that it does not show up as transparent. Is this possible?
pic9.png

You can not have this with monochrome fonts, but it is easy to accomplish with color fonts.

Note: on Mac the color font features are currently limited, so better use the Windows version for now.

Thanks, I still have a PC desktop and have been switching over to it for things like bulk transformations. I’ll do that. But the Mac version (on my laptop) is coming along nicely!