Backdrop filter for nav drop down

hi anyone able to figure out how to get a backdrop filter working on nav dropdowns? I saw multiple posts asking the same but no solution. Is this possible?

What exactly is a backdrop filter? Do you mean adding a filter on the dropdown list element? Which filter are you hoping to use?

Hi, here is a read-only link. When the drop-down menu drops down i want to blur the area behind the menu. currently it’s just transparent.

https://preview.webflow.com/preview/joes-site-c098f9?utm_medium=preview_link&utm_source=designer&utm_content=joes-site-c098f9&preview=55d2a20e2e8612d67cab36bd8cb898c4&workflow=preview