Thanks Werner Puchert! Much appreciated. I’m not entirely clear on what you are trying to do and not sure what type of converter you are referencing, so not sure how best to advise you. I need a little more clarification I think. I have used the Rode VXLR 3.5mm to XLR Adapter that will allow you to plug into XLR.
Rode is introducing a new adapter for 2 Smartav+ for iPhone that looks pretty interesting (Rode SC6-L Mobile Interview Kit)
There is also really good technical info about the ports of the H6 here that I think will help you:
Happy to help if I can. Keep me posted,