CMakePresets: Joining a substring to an inherited env variable

Hello all,
Does CMakePresets enable to update a parent enviromment string variable while inheriting ? In my case I would like to append a substring to the SAME variable, like:
"environment": { "FOO": "$penv{FOO},blabla" }

There is not currently a way to append to an inherited variable. You can append to either the same variable that was passed into the process or a different variable.

@kyle.edwards thanks for that !
However I am not sure to understand what do you mean by “append the same variable” … do you have an example ?