You want the "Publish Metrics" function: https://docs.cribl.io/stream/publish-metrics-function/

you mean use that function to rename a json field like the one above to the value of another field and assign it a value of a different field?

Like this:

this works for single perfmon metrics. I just tested with MultiKV metrics and it doesn't.

Would you be willing to provide a sample input and the desired output? DM if you want

I think you're in a private channel if you want to invite me there for a discussion

sure. thanks. I'll upload sample data as well in the morning to the private channel.