Most DoVi content is Profile 5, which is non backwards compatible with HDR10. Decoding that into something usable requires Dolby IP, so that's not happening. If you try to play it without the special Dolby magic the colors will look completely wrong and you'll have huge luminance shifts.
If you come across Profile 8.1 content, that's an HDR10 base, which you could just play directly, or analyze and generate HDR10+ metadata from. Then you could theoretically mux that in without re-encoding. Some streaming services intend to deliver all 3 formats this way.
I don't think anyone is using it yet though.
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