How to make Java swing "look and feel" look like a native mac app

I've been working on a Java GUI on the IntelliJ app (built-in GUI window builder), and I want it to look like a mac app (rounded, well polished), I've run it on my windows machine (windows 10), and it does not look the same as it looks when I run it on my friend's MacBook Pro (Big Sur), how do I make it look like that/ something as sleek.