FindPython: how to override Python_EXECUTABLE from user perspective?

Please consider the following test case:

cmake_minimum_required(VERSION 3.12)
project(test)
find_package(Python REQUIRED)

This finds the newest Python installed on my system. However, I can't find a way to force a particular version via cache variables (i.e. as an user, without modifying CMakeLists.txt).

In the old FindPythonInterp module, this was trivial: it was sufficient to pass -DPYTHON_EXECUTABLE=.... However, the new module seems to ignore override of -DPython_EXECUTABLE=... and force 3.7 nevertheless.

Is such user override possible? And if not, can the module be fixed?