Could something like this be done for variables?

https://preview.redd.it/umbvwahun1ed1.png?width=1154&format=png&auto=webp&s=829830802903be169661b9958120cc83dfb0635d

It would be really useful if you could just drag variables into boolean inputs the same way custom blocks with the return function currently can. Now I have to use the utilities extension which I really don't prefer. I know there are ways to get variables with a custom block but it would be so much easier to have it built-in. I understand that something like this might be pretty hard to code but I still think it would be worth the effort.