It is unclear what you are asking. What you are asking sounds more like using something to add color to the monochrome on the screen, like the Magnavox Odyssey [1] or the Vectrex [2]. But that would be orthogonal to what this is doing.

[1]: https://youtu.be/Lc8swrtGer4?t=211

[2]: https://www.youtube.com/watch?v=uz3QAj7I3MQ