Optional chaining in query parameters for rest connectors

[nehalicious]

https://hasura.io/docs/latest/api-reference/kriti-templating/#kriti-optional-chaining

Hey, I'm trying to configure a rest connector to use optional chaining for query parameters. Essentially something like this:
foo: '{{$body.input?.foo}}'

However, when i try to save this, I see an error saying
"LexError: Invalid Lexeme: '?}}\"'"

does anyone know what could be going wrong? If I look at the documentation, this seems like it should be fairly straighforward https://hasura.io/docs/latest/api-reference/kriti-templating/#kriti-optional-chaining

[adas98012]

Thanks for bringing this to our attention. I am creating a Github Issue for this.