I remembered seeing a feature request for this - particularly mentioning Ricoh. However, I only see the one for other brands (particularly Leica) and it has only one vote. I suggest reading that thread to understand the problem. But I would like to see DxO support these cameras.
I think these feature requests should be merged so that there isn’t duplication. But please don’t forget to add your own vote! Creating a feature request doesn’t mean you vote for it.