I would like to read some data from other websites for a project using Google Script. The pages in questions are Dyanmic; they contain content that is loaded after
Not generally, no. If you can reverse engineer what it's doing, you might be able to do the same JavaScript calls, but the odds are against it if it requires any server coordination. In theory one could run a JavaScript browser implementation inside of Google Apps Script (like env-js) which could do this, but in practice I think it would be very difficult if not impossible to make it work.