Dmitriy Neretin created LOG4J2-1589:

             Summary: Value nesting during property substitution
                 Key: LOG4J2-1589
             Project: Log4j 2
          Issue Type: Wish
          Components: Configurators
    Affects Versions: 2.5
            Reporter: Dmitriy Neretin
            Priority: Minor

There is already a good description what "default value nesting" is: (use your browser search 

It is partially implemented in the log4j but it can still be improved.

Example from that page above: "${id:-${userid}}" If the ${id} variable is not 
set, ${userid} will be used.

At the moment it works only if the default value is a concrete value:

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