For my opinion it’s quite easy:
There is no “info field” - only NAME, CMT, DESC are relevant for information about the waypoint in a gpx-file. And NAME is enough to work with.
If you name your waypoints (mostly Via-Points I guess) in Kurviger the exported gpx-file will contain this information. Take this example: https://kurv.gr/SsuvH and export it with this specification:
I named Start, WP2 and End by “München”, “Regensburg” and “Nürnberg” and if I import the corresponding gpx-file into BaseCamp these names are there - proven by the export out of BaseCamp: München - Nürnberg bc.gpx (539,3 KB) or by this screenshot:
Don’t know what MRA does and I’m not interested to learn it.