How to set CRS of GNSS receiver? - feature request needed?

[gdt]

In the docs, I have not found information about how to set the CRS of the GNSS receiver. My case of interest is using an F9P with Network RTK reference data. My local provider is the Massachusetts Department of Transportation (MassDOT), and the network's reference frame is "NAD83(2011) epoch 2010.0" (henceforth abbreviated NAD83), which is the United States National Spatial Reference System. (That makes sense because the federal government, MassDOT, and MassGIS all work in that frame, which is more or less crust-fixed, but it is what is offered.) As background, NAD83 and WGS84(G2139)/ITRF2014 are about a meter different near me.

This means that coordinates in the NMEA stream are NAD83 rather than some flavor of WGS84. I'm currently capturing tracks and points with Vespucci as .gpx and .osm, and on adding them to qgis labeling them EPSG:6319.

With QField, I need to tell it the CRS of the NMEA stream. Yes, I know there is a datum sentence, but it really isn't useful.

Besides WGS84(G2139) and NAD83, the datum could be some iTRF2008 with SBAS.

[gdt]

Since nobody told me I was confused, see #2855