I'm not sure if it's possible, though you're at least the third person asking this today, I wasn't aware that Resolve got so popular!
Do you know of any Resolve plugin that implements this sort of thing (adding a new format for import / export), to look at as an example?
AFAIK Resolve doesn't have a public SDK for writing import / export plugins, at least I'm not aware of any.
I'd also love to add MagicYUV support to Resolve, but I'd need some help here.
No plugins that I know of.
Although they are pretty open when it comes to taking feedback and implementing it.
I wonder if they will add support if you present them with it.
You might want to tune into the following thread on the BM forums then: https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=98232