

just that the mobile Proton Mail app does not support fulltext search. I know why, but I still think it’s doable the same way as in the web browser
If your mobile has a modern Web browser I’m pretty sure you can do full text search in there too.
Also FWIW it’s a constant struggle for everyone.
Corporations do their very best, both technically but also with marketing and lobbying, to make it nearly impossible. We have to learn, help each other, vote and it will never stop. Still, each step mattes so kudos on even attempting.

CoMaps can export a GPS Exchange Format (GPX) route. See https://wiki.openstreetmap.org/wiki/GPX and that can be used to get most of the data your need. I imagine you could write a spreadsheet or online to do your visualization. I also bet others already did it.
I’ve done something like that for hikes to plot the path in 3D for WebXR.
As others points out GadgetBridge if you want additional data, typically biosensors for heart rate monitoring, is great to see which hardware is supported.