Thanks Martin, I had tested to change this, following this answer to a similar post here [SOLVED] Can I properly enable OpenCL on Windows 11 and Intel Iris Xe graphics in Darktable 4.0? - #16 by olliwa. At the time it hadn’t worked. Maybe I was changing something else at the same time.
I tried it again today, and I can now activate OpenCL. Exports are quicker and the laptop’s fans do not scream anymore, thanks for the help !