Summary

There are 3mf files if you have AMS or multicolor printing available. Otherwise use the method that I use:
The text and cavity is exactly .2mm high.
Set to your first layer height to .2mm (probably the default). In the slicer, line up the text with the sign piece. Then delete one at a time and slice+save separately. Print the text first in the first color. Then print the main sign in the other color over the text. The plastics will melt together and look seamless.