how to share the variable between doxygen and plantuml

Question

I would like to define some variables and use them in .dox and plantuml in .dox. Is it possible to do that?

Currently, I defined the same variable at both places, Doxyfile and .pu to use the variable in .dox and plantuml in .dox. It is working but double work.

doxygen version: 1.10.0 (ebc57c6dd303a980bd19dd74b8b61c8f3f5180ca)

Example:

By adding ALIASES += CommInterface="I2C" in doxyfile, I can use the variable by \CommInterface in a.dox.

I can also define a variable in config.pu by !$CommInterface = "I2C". Then I can use the variable in the plantuml in a.dox.

@startuml
!includesub config.pu!Config

$CommInterface
@enduml