Angolia's HJ mentions briefly the regional inspectors motor HJ insignia that was worn by Gebeitsinspekeure but it does not mention the rank held by that position, but I would think it's a more senior rank due to the position. Some of the Feldschar insignia chapter also mentions doctors and dentitsts who I would also assume held a higher rank. Angoias Vol 1 page 36 referecing the model 1936 pattern leaders tunic also mentions this,
" Shoulder boards were worn on both shoulders, and the HJ sleeve armband and district triangle were worn on the upper left sleeve in addition to other authorized HJ insignia."
Angolia does not go into detail as to what this "other authorized HJ insignia" consists of, or list the source or regulation for the information provided. This could be interpreted as specialist or qualification insignia, but I havent seen a photo yet.