Combining two labels for notification

I am using logfmt to break my log in to labels. “Id=” will always be the same, but the second part of that is a number that can be different (i.e. “_89=” or “_109=”). I am hoping to get this label added to the description so it can be displayed in the slack message. Can anyone help with this, please?

Technically, the numbers are the value of Id. I don’t know if that makes a difference in what I am trying to do.