Chess board matrix annotations eg. B3, E6

Hi! I’m pretty new to Rhinoceros and Grasshopper.
I have a painting on a grid designed where some of the colours are filled in (see it as a pixel-arty piece)

To make it easier to manually process the painting I want to add Coordinates in the field (see the picture) How can I program this in the easiest way?

Thanks in advance!


This could be a solution. (11.9 KB)

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Hi magicteddy,
Looks like a splendid solution.
Thank you for your fast and splendid help!