There are multiple ways I have solved this. You can add a small chamfer into your design for every edge of the lettering, although this is a pain, or you can adjust the first layer expansion compensation.

Go with the empirical method and measure how far off the first layer is expanded compared to what the measurement should be. Then dial this average figure into your first later expansion compensation.

I know how this works with prusa slicer but I do not know how this terminology translates to Cura if you are using it or something else.