How to refer to fields with dash in name in Exec


I'm working on a setup for collecting IIS logs and send them to Graylog.
Here I stumbled into a problem with refering to fields with a dash in the field name.

I would really like the fields to have prober w3c names in greylog, so I dont wanna remove those dashes.

In the CSV module I have:

AskedMarch 18, 2019 - 1:41pm