Even without the “don’t use tech preview features in actual apps” caveat, you’ll currently have to jump through several hoops to make this work. For example, when I tried, the version I had available wouldn’t let me call into a non-null-safe library (which Flutter SDK currently is). This will eventually get fixed. But right now, limiting yourself to small experimental apps is a good bet.

I’m also looking forward to use this feature in Flutter, but unless you’re super motivated and have a lot of time on your hands, I recommend waiting with that.