We have a geopoint type question in a Survey123 form, and currently it is using a default basemap like this:

The user would like to see other feature layers displayed in this Location window, we have created a map in AGOL, is there a way we can specify which map to use as the basemap, just as we can in Report generation etc?
I note we can use other ESRI Basemaps, but I cannot see my own maps in this list.

Thanks