How to set job pool for step targets defined by ExternalProject_Add_StepTargets

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As the doc of cmake property JOB_POOLS says

Defined pools could be used globally by setting CMAKE_JOB_POOL_COMPILE and CMAKE_JOB_POOL_LINKor per target by setting the target properties JOB_POOL_COMPILEand JOB_POOL_LINK . Custom commands and custom targets can specify pools using the option JOB_POOL . Using a pool that is not defined by JOB_POOLS causes an error by ninja at build time.

But I find no way to set it for step targets of external project.

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It looks like there’s no way to control JOB_POOL for the inner add_custom_command. That seems worth a feature request.

FYI: @craig.scott