"Unexpected labeled statement" warnings with Create React App

How would I go about fixing this block of Firebase-related code, to conform to CRA's ESLint rules:

db.broadcasts.on('child_added', (snap) => {
    this.setState((prevState) => {
        broadcasts: prevState.broadcasts.push(snap)
    });
});

Here are the related errors:

I've tried allowing loops:

/*eslint no-labels: ["error", { "allowLoop": true }]*/

But that gave me the following error:

error    Unexpected labeled statement 

Thanks