Hi Wolfgang,
I did of course a search in this forum before and also found this post, About color profiles and Lightroom integration.
Photo-DKO is mentioning DNG and export to LR as to be working fine. So I thought, best way also for me.
Besides this, but more another topic maybe, I would like to use sth else besides LR. But on my research I found mostly only LR and PS when talking about Softproof. Couldn’t find an alternative to it, which does the same job. And yeah, also voted for softproof in PL 