Styled Components in Expo Web

Having issues using SC in Expo Web. I am unable to edit styles in development. A fix is mentioned here: https://www.styled-components.com/releases#v4.1.0

webpack.DefinePlugin({
SC_DISABLE_SPEEDY: true,
});

I have attempted to edit my expo webpack config following this: https://docs.expo.io/versions/latest/guides/customizing-webpack/

But struggled to get it working. Any ideas how to SC_DISABLE_SPEEDY in the expo webpack config file?