How can you pass a user variable as a parameter in a URL opened via an action menu?

Summary:

What is the syntax necessary to pass the value of a user variable in a URL action menu?

Content (please ensure you mask any confidential information):

I have an action menu that opens an OAC query via URL. I am passing parameters in the URL based on the form context and the cell being clicked on and this works, but I would like to adjust one of the parameters to reference the value of a user variable instead of the form context. I can't seem to find anything and I can't get any of my ideas to work so hoping someone has a solution.