cannot nest Include macro in CSV

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I want to auto-generate tables in csv form, and have them show up in the wiki as soon as they're checked in. The CSV and Include macros have the two functions I need, but won't nest. Here's a test:

trac tests

bracket form Include doesn't work in brace-bracket CSV

Error: Failed to load processor CSV

No macro or processor named 'CSV' found

next: CSV works in bracket form

CSV(hi, there)?

but: bracket Include in bracket CSV doesn't work

CSV([[Include(source:python/systemTests/weakSignal.csv)?)]]

although bracket form Include works on its own