x265 and Dolby Vision

[ghostshadow]

Hello, is it possible today to encode a UHD Dolby vision in x265?
If so, I would like to know the method.
I tried by extracting the 2 Dolby layers (BL + EL).
The BL being the main layer with the video and the EL mainly containing the specific dolby meta if I understood (afterwards I only had a Dolby UHD available).
I tested by encoding the BL layer and giving the dolby-vision-rpu the EL file.
- it does not work rpu non-compliant.
I tested without dolby-vision-rpu.
-it does not work.
I tested by 'merging' the BL + EL with the 'yusesope' method and encoding this track BL_EL.hevc without dolby-vision-rpu.
-it does not work. Mistake :
x265 [error]: x265_encoder_open () failed for Enc,

aborted at input frame 1, output frame 0 in x265

So we have to do a mkv remux of the UHD dolby vision, then extract the video track (as usual when we do standard hdr versions), and encode this video track by specifying just the –dolby-vision-profile?
thank you in advance