You can use HTML entities within literal text in JSX.
function App() {
return <h1>°F</h1>;
}
You can use the unicode number corresponding to the entity if you need it inside a string.
function App() {
return <h1>{'\u00b0'}</h1>;
}
A few other ways of approaching it are listed in the JSX Gotchas part of the documentation.
Usually I just type the actual symbol. In your case: ºF
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