Unwrapping multiple labels

This is a feature request (let me know if there’s a better place to post this): would it be possible to add support for unwrapping multiple labels? Currently “unwrap” only takes one argument.

Sometimes I have log lines like “a=123 b=234 id=abc”, and I want to get both “a” and “b” labels returned like:
[{“metric”:{“id”:“abc”},“value”:[ts,“123”,“234”]}.

I’d like to use values from both “a” and “b” in 1 query. Without this feature I need to do one query per label.