Configuring Custom Tile Server in Maps

I recently got an OSRM instance running and configured Nextcloud to use it for generating driving directions. I would like to do the same with a tile server, but I can’t find where I’d specify a custom tile server for the Maps app. Am I overlooking something obvious? Is this option only available in the PhoenTrack app?

it is hardcoded, but in theory pretty easy to change with copy-paste

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Could you help me find where this file is in the AIO?