Possible to create a Python virtual env from CMake and then find it with FindPython3?

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It is not a common pattern but you can try the following:

find_package (Python3 COMPONENTS Interpreter)
execute_process (COMMAND "${Python3_EXECUTABLE}" -m venv "/path/to/venv")

# Here is the trick
## update the environment with VIRTUAL_ENV variable (mimic the activate script)
set (ENV{VIRTUAL_ENV} "/path/to/venv")
## change the context of the search
set (Python3_FIND_VIRTUALENV FIRST)
## unset Python3_EXECUTABLE because it is also an input variable (see documentation, Artifacts Specification section)
unset (Python3_EXECUTABLE)
## Launch a new search
find_package (Python3 COMPONENTS Interpreter Development)
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