Is multi-threading possible for the GATK GermlineCNVCaller and PostprocessGermlineCNVCalls tools?

Question

[Frieda]

Is it possible to specify the number of threads for GATK GermlineCNVCaller and PostprocessGermlineCNVCalls?

After checking several websites, I understood that apparently some of the GATK tools have a Spark version that allows multi-threading, but neither GermlineCNVCaller nor PostprocessGermlineCNVCalls have the Spark version.

I also tried specifying --native-pair-hmm-threads, but apparently this flag is not valid for these two tools.