Hi MxxCon! 
While making edits I relied on the instruction with :lanes:psv tag https://wiki.openstreetmap.org/wiki/Key:lanes:psv#:~:text=OSM%20way%20points%20in%20direction%20of%20photographer where tag lanes:backward uses in combination with lanes:psv:backward. Added the lanes:hgv:backward=1 in combination with lanes:backward=1 to specify the number of HGV lanes that are present in the backward direction. 
The same is for the oneway=yes tag, it is used in combination with oneway:hgv=no like highlighted in the OSM wiki. 

Best regards, Stepan