Config custom background map in UI

Hi, is it possible to configure custom background maps in the config.yaml file? These maps would then appear in the list of available maps.
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This is currently not possible in the config only in the source code.

Do you have any suggestions on which files I should start looking at to make this change?

This one: graphhopper-maps/src/stores/MapOptionsStore.ts at b988eeb7c06d1b320de65b646ea119addf2814bb · graphhopper/graphhopper-maps · GitHub