image-hdr VS hdr10plus_tool

From what I gathered, it is possible to convert HDR10+ content to Dolby Vision using dovi_tool and hdr10plus_tool. But I haven't seen any tutorial on doing the opposite: taking the dynamic metadata from Dolby Vision and converting it to HDR10+. I have found posts with this question but with no solution. The replies to this one (from 2020) suggest that it is theoretically possible but that you would need more info about the DV metadata. Now, using dovi_tool, it is possible to extract the Dolby Vision metadata into a JSON file. But, while dovi_tool is able to generate a DV RPU using a JSON file containing HDR10+ metadata, hdr10plus_tool has no similar option. Is there any way to convert the DV metadata to something usable by hdr10plus_tool to inject in HEVC?

NOW, for dynamic HDR (HDR10+ or Dolby Vision), it's more involved but there is indeed a way to create encoded files with dynamic HDR metadata now by using dovi_tool for Dolby Vision, or hdr10plus_tool for HDR10+ files (or you can use BOTH on it if you have a file that is compliant with both standards). This one requires de-muxing the dynamic metadata from the isolated HEVC videostream of your source file, encoding your file an isolated HEVC stream, injecting the dynamic metadata back in to the encoded HEVC stream, then finally merging that with your MKV containing everything else. This is more complicated but here's the script for THAT...

downloaded quietvoid's HDR10Plus_Tool 1.0.0 (from https://github.com/quietvoid/hdr10plus_tool/releasesl)

You could also try converting the mkv to mp4 using ffmpeg and manually copy the HDR metadata over, which Premiere Pro then understands. It's just a bunch of tags telling the software what the pixel numbers mean. This can be done with reencoding, or maybe without if the mkv contains a video stream already in the right format and just needs to be moved into a mp4 (might not even require manually specifying metadata, maybe the converter you used just didn't support it). I'm not sure about formats like HDR10+ that have multiple metadata updates in a single video, you could use this to extract the metadata but I don't know how to pass that into ffmpeg again.