mgrs 10km with custom label 171

Question

https://transparentgov.net:3200/googlemaps171/default?layer_id=0&layer=Grid_10km_north_america&center_lat=37.750995580987706&center_long=-122.24250821070036&center_zoom=11&url=https%3A%2F%2Fgis.la-quinta.org%2Farcgis%2Frest%2Fservices%2Fcoordinate_systems%2Fmgrs_10km%2FMapServer&overlayType=overlayType_image&dynamicLabelField=TLM_LABEL&panto=0