GDB "Additional Startup Commands" Variables are not processed

In the "Additional Startup commands" variables may get insterted. They seem not to get resolved.

For example this startup command:

 set solib-search-path %{ActiveProject:BuildConfig:Path}

If the debugger is started and "show solib-search-path" is entered as a debugger command, the response is:

<438show solib-search-path
{{ >&"show solib-search-path\n"}}
{{ >~"The search path for loading non-absolute shared library symbol files is %{ActiveProject:BuildConfig:Path}.\n"}}
{{ >438^done}}
{{ }}

So the variable doesn't get gesolved.

Entering the full path for solib-search-path manually works. But only if the path is not quoted (e.g. using ").