UTM grid display in OM?

[Off-track]

I find the 'standard' UTM 1km grid to be very useful when hiking. It is built into some geopdf mapsheets, but not into other maps that I have tried in OM (like OpenAndro vector maps or wms mosaic raster maps).



I know that OM can import maps based on UTM, and it can show waypoint coordinates in UTM, but I have not found any way to display a UTM grid on a map in OM. If I am not missing an existing feature it would be great to add (maybe as an option in overlayers?)