You could try to talk with Niri developers on Matrix - https://matrix.to/#/#niri:matrix.org

My example:

xfreerdp “$RDPW_FILE” /u:“$RDP_USERNAME” /p:“$RDP_PASSWORD” /sec:nla /cert:ignore +clipboard /multimon /monitors:0 /gateway:type:arm /network:auto /gfx:AVC444 /rfx /dynamic-resolution

Keep in mind that I was using for accessing Windows machine… Some flags might need to be a bit different

Freerdp 3.x has this support. I have been using it half a year back for this very purpose. Ask for help on #FreeRDP:matrix.org they are very helpful