Here+ RTK support?

Hello,
I wanted to know if the FW support the RTK mode? (with the Here+ for example)
I can see mavlink messages about the RTK, but there is no handling of them in the code, do I miss something?

RTK GPS is supported by PX4, including with the Here+ module:

https://docs.px4.io/en/advanced_features/rtk-gps.html