Dependent fields in select dropdown menu?

I’m triying to create a simple page with a couple of dropdows that interact with each other.

The goal of the page is to show CMS post related to the selection of both dropdows, for example:

I want to migrate from “X company” to “X company”

I can do that with simpler CMS filters and tags but I don’t find a way to not show repeated options in the second dropdown.
It would be perfect to have a way of only showing the companies that already have CMS content related (not every combination has content)

Does anyone know if this is possible to do in Webflow?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)