add alternative to install(CODE "...") with code block instead of code string

currently i use this code to implement postinstall commands:

install(CODE "
    message(STATUS \"PostInstall: target: If QtDBus.abi3.so exists, copying QtDBus.abi3.so to /build/tmpz5es9eq4/wheel/PyQt6\")
    execute_process(COMMAND ${CMAKE_COMMAND} -E copy QtDBus.abi3.so /build/tmpz5es9eq4/wheel/PyQt6)
")

this is ugly, because the cmake code is in a string

i would prefer to put my code in a block, so i dont need to escape the doublequotes:

installcode()
    message(STATUS "PostInstall: target: If QtDBus.abi3.so exists, copying QtDBus.abi3.so to /build/tmpz5es9eq4/wheel/PyQt6")
    execute_process(COMMAND ${CMAKE_COMMAND} -E copy QtDBus.abi3.so /build/tmpz5es9eq4/wheel/PyQt6)
endinstallcode()

i dont want to use install(SCRIPT path/to/script.cmake), as i want to generate one monolithic cmake file

another advantage of such "inline code" is syntax highlighting