Allocate more RAM for build?

During the build Unreal sees 8.58 GB of RAM available, but in the Task Manager I can see that RAM usage is 20 GB out of 31.8 GB. So, during the build the CPU works only at 34%, which doesn’t make sense because there are 12 GB of RAM free.

I know usually you don’t expect reasonable behavior from Unreal, but is there a way to use all available RAM at least during builds?

UATHelper: Packaging (Android (ASTC)): Determining max actions to execute in parallel (24 physical cores, 32 logical cores)
UATHelper: Packaging (Android (ASTC)): Executing up to 24 processes, one per physical core
UATHelper: Packaging (Android (ASTC)): Requested 1.5 GB memory per action, 8.58 GB available: limiting max parallel actions to 5
UATHelper: Packaging (Android (ASTC)): Using Parallel executor to run 1310 action(s)
UATHelper: Packaging (Android (ASTC)): ------ Building 1310 action(s) started ------
UATHelper: Packaging (Android (ASTC)): ** For UnofficialEmpty-Android-Development **
UATHelper: Packaging (Android (ASTC)): [1/1310] Compile [x64] PCH.ResonanceAudio.h
UATHelper: Packaging (Android (ASTC)): [2/1310] Compile [arm64] PCH.ResonanceAudio.h