Note, just adding the blockly library isn’t going to do anything for you.
Integrating blockly for actual event/game logic is going to be a pretty huge effort. None of the event consitions and actions themselves are going to be reproducable directly just by loading blockly, so you would have to bind each javascript action you want a blockly block.
Folks here aren’t going to be able to assist you with that as you will basically be rebuilding all of the event condition/action abstraction logic from scratch.
Yes, I think Blockly’s library is available in various programming languages. The problem is that Blockly is usually designed to work with web applications. The challenge is integrating it into GDevelop. One way to achieve this is by integrating HTML as an object and running it with a JavaScript function. So, it is possible to realize this idea. I know it requires effort, and I think I’m ready, but I don’t have the time to try several methods. Instead, I’m searching for an effective one. Thank you.