I need help in my new simulation game based on scratch from MIT

Hello eveyone.

I am working in a educational project to simulate in Unity the scratch enviroment like scratch.mit.edu.

I create the category menu in the left, and when I clicked in one category I showed the blocks contained in it.

But I can’t display the block in the correct form.

¿Is it possible to do with UI Toolkit? or ¿Do I need to use RectRansform and GameObjects?

Where can I get projects like this? or where can I see get documets or information like this?
Thanks in adsvance