automatically add a string to an url in a button

Hi,

I have a GP block element that is showed at the end of about 50 pages.

In this element there is a button. I need this url to point to another website of mine to a specific page, based on the source page.

For example:
domain1/page1 -> domain2/page1
domain1/page2 -> domain2/page2
etc

I am not a programmer, I have thougt that
the button could have a shortcode (or a string anyway) in the url and this string is replaced by a snippet

The url is simply made of 2 parts: static (= domain2/ ) and dynamic (page1, page2 etc)

If I could take the second part either:
- from the url of the page in domain1 (domain1/page1) provided that the 2 sites shares exactly the same page slug
- or from a custom field I can set in each domain1 page

Any idea how I achieve this? :)

Thank you All the best