Need Help w AVISynth+ HDR UHD and Intel Arc A770

[Qaenos]

I had a NVidia GPU and I was successfully opening mkvs taken from UHDs using a combination of DGSource() and DGHDRtoSDR().

I've switched to an Intel Arc A770 discrete GPU and the DGHDRtoSDR no longer works because it needs uses CUDA for HW acceleration.

What do I need to do to open a UHD HDR mkv with AVISynth+ using my Intel A770 for HW acceleration?

Here's an example of the type of file I am trying to open:

Video #1
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : 36
Duration : 2 h 13 min
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primar : BT.2020
Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 787 cd/m2
Maximum Frame-Average Light Le : 506 cd/m2