Hello , yes this would be a really nice feature in terms of expanding usage cases I think. Your second picture would also be good, maybe this time for an inventory, but in that case the ability to display numbers ( in the bottom right corner as you did ) could serve to show shortcuts to the items for the player.
Tanks for taking my suggestion into consideration.
Edit : From a "coding" perspective ( I'm not a coder, I use Clickteam Fusion which is a no-code app creator ) it would be necessary to have the ability to export the letters separately from the grid ( with the appropriate size based on grid size ) so that letters can be included dynamically in the grid.