How can I load CSS (not CSS modules) lazily?

[RobbieGM]

I have a CSS file that provides styles for the react-notifications-component library. I was importing it in my _app.tsx as recommended in the docs, but lighthouse suggests deferring non-critical CSS. Is there a way to import that CSS so that it will be loaded after the main render-blocking CSS file rather than concatenated with it, improving page load times?