Hi toybox,
Thanks for reaching out to Apple Support Communities. It sounds like you have a question about supported HDR formats with Dolby Vision on your MacBook Pro. We're happy to provide some information to assist.
"The built-in display and Apple Pro Display XDR support Dolby Vision, HDR10, and HLG. Dolby Vision and HLG are converted to HDR10 when viewed on other HDR10-compatible external displays." You can find this information and more details here: Play HDR video on Mac
If streaming, you'll also need a fast internet connection. You can view additional details and requirements in the section "Here's what you need to watch the highest-quality video available" from the article here: Find movies with 4K, HDR, Dolby Vision, or Dolby Atmos in the Apple TV app
If you need further assistance, reach out to Apple Support directly.
Contact Apple Support
Cheers!