Not able to set API method in Grafana infinity variable URL


I want to set the API request method for the variable as shown below in the URL option but I am not getting the “Advanced Options” pop-up. I am using Grafana version 7.3.6. Please let me know how can I configure the POST method and the query which I want to send.

I am the author of the infinity plugin. I would suggest you to check the related github issue about variable editor.