Either this or you are able to analyze what Sovol has been doing originally and are able to either replicate or work-around the missing modification in the original Klipper.
No idea as I do not own this printer. Their original firmware can be downloaded here: Firmware Download
It seems that there are instructions available as well.
This is exactly the “trap” you run into when having manufacturers that do not abide to the license and open source philosophy. Some thoughts on this here: Importance of Open Source in 3D Printing and the Consequences of OSS License Infringement