I just started using Emotion 9. As my app runs exclusively on the latest version of Chrome, I wanted to use autoprefixer and set the browserlist as such. I couldn't figure out how to do it from searching around in the docs/issues.
Emotion uses stylis which does not support browserslist and also does not seem to have plans to do so (https://github.com/thysultan/stylis.js/issues/76#issuecomment-346882924). Most of the prefixes are hardcoded in source, as you can see here.
However, if you really wanted to you could probably create an emotion instance and provide a custom prefixer function to just prefix the rules you want to support, see this and this.
Thanks, I set prefix to false.