Issue with Box widget + Modal PopUp

Hello. I’m using the block widget function like in this video https://www.youtube.com/watch?v=I-96V-J9VC8 but I want the read more button to display a modal, either the post URL as a popup or a custom template with the excerpt and an image. I’ve used multiple pop up plugins for elementor and they show the modal but it’s always the content of the firs post. I’d like to know the solution to this, it should be dynamic.