Connecting collection with filter

Hi, I have a question!

Collection 1. - project realizations - for example “Garden project Warsaw 3000m2”

  • I have a collection with our project realizations - each element includes information such as in which voivodeship the project was carried out
  • this collection is linked to the “our garden realizations” page

Collection 2. - voivodeships

  • I made a second collection to expand SEO traffic
  • the collection is about voivodeships where we carry out garden projects, and I describe each voivodeship - on a single-page type site, I connect rich text to the article, and it works well
  • I would like Collection 2 to display our projects from Collection 1 based on the voivodeships.

How can I apply such filtering?

Collection 2 single page (need voivodeship filter for grid at the top,