IIRC, though DS no longer support DSON, their 'T+C' barred redistribution, reverse engineering etc etc...

Although a tad long-winded, you can export clad figures from DS as rigged FBX which Poser may read.

I managed to get Kalea7 Rogue, a former DS freebie, into Poser thus...

https://www.renderosity.com/gallery/items/3103742/ds-kalea-7-rogue-ported-to-poser-as-fbx-yay

FWIW, I routinely port DS props to OBJ+MTL for use in Poser. DSF Tools ($$) is now un-supported, and seems to hang on DSF files above ~1 MB. YMMV.
DS' UI gives me a prompt migraine, but its Poser-scaled 'OBJ+MTL' export path has no problems with even '>> 10 MB' files.

https://www.deviantart.com/nik-2213/art/Porting-DAZ-Studio-props-to-Poser-friendly-OBJ-MTL-911478576