Is it possible to do something like this in extensions.conf?
[${CONTEXT}]
switch => Realtime/${EXTEN}@extensions
${EXTEN} is accepted, but ${CONTEXT} not.
Will this be added in the future?
no, if ${CONTEXT} is a variable it will contain the name of the context a call is currently in. Thus if you make another context with it, you will have two contexts of the same name.
besides i believe context names cannot include variables, as they are only parsed/interpreted on a reload…