Import Export HDR workflow Premiere Pro

I try to understand the HDR workflow of Premiere Pro. I want to import HDR (PQ BT2048 and HLG) and Sony SLog3 footage, color grade/translate it according to HDR HLG standards and export for HDR broadcasting. I have several questions about it:

  – There are different HDR types in the market (HDR10, HLG, PQ BT2048 and Dolby Vison). Which does Premiere Pro support (import and export)?

  – Premiere Pro seems to translate colors of an imported HDR HEVC file, to a Rec.709 color space. Especially PQ BT2048 files get extremely overexposed and way to much saturated on the program monitor panel, and on my SDI output with a BM Decklink 4K extreme card, without any lumetri/LUT effect on it. When I play the file with ie. VLC player it shows a low saturated flat picture. So Premiere Pro does something to the orriginal colors. Can I change the way Premiere Pro interprets HDR footage?

– Color grading with Lumetri in HDR mode seems to work still in SDR 709 gamma/color space. The Waveform in HDR mode has a scale from 0 to 10K, but my Sony FS7 Slog3 footage gets overexposed near 100 on the waveform scale. Why? Because the XAVC file of the FS7 has Rec. 709 color primaries in it? How can I change Premiere Pro’s behavior in handling this footage?

– Can I output HDR on a SDI output of a Blackmagic Decklink 4K Xtreme to a HDR monitor (Atomos SUMO19). What type of HDR protocol is being used by the render engine of Premiere Pro on SDI output? So which protocol should I choose on my HDR monitor?

– What kind of HDR protocol does Premiere uses when I export a HEVC HDR Rec 2020 file? Is that compatible with YouTube, or consumer HDR TV’s? And what protocol is being used for JPEG2000 HDR export? Or XAVC HDR export? (I saw both supported Rec2020 color space).