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AFAIK the only software that supports this is Makemkv, and it only supports doing it from the original source. DolbyVision is proprietary tech, so reverse engineering it has been difficult. There is also the issue that only certain profiles of it are playable on certain devices, and even if you did this correctly, it's possible the device you are trying to play it back on doesn't support it. DolbyVision was also only just recently added to the mkv spec, so not all tools support it.
Preserving DolbyVision is easy to do from the source, but not possible I believe when trying to alter your backup. So what you want to do is re-rip your disc and put it into mkv container, and then add your additional files.
If I am wrong, someone will correct me while also giving the correct means to do so.
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