Pass quickbase field into code page

Conceivably this is a very simple thing, but all I'm intending on doing is passing a quickbase field into an HTML object embed on a code page.

The use-case here is to filter and embedded Tableau report using the quickbase field. I've been able to successfully embed the HTML but am struggling to figure out how Quickbase "recognizes" and passes its fields into an HTML or Javascript object on a code page.