Regular javascript expressions not available with custom api authentication setup

when following this guide Custom API authentication
I noticed that regular javascript expressions cannot be used i.e. trying to set the body parameter value of an API Request to {{ }} or {{".", "-") }} both don't get replaced for the actual values.
Is this intentional or a bug? because it would be very useful to have this functionality available here.

Hi @cnvs thanks for reaching out! Agreed that it would be very useful :slightly_smiling_face: It's currently a feature request that is in development. I don't have a timeline yet, but I'll post on this thread if I get any updates about this feature shipping