Do you need to specify CRACO how to run react-dotenv before react-script? If so, how?

Reading the doc here it specify

"start": "react-dotenv && react-scripts start", // <-- append command

Where can I redefine the craco start command? It should run react-script by default, but i'm not sure it will know that it now should run react-dotenv too. It seems to be working though so maybe it does?

Thanks for the help, not posting often so feedback welcome if the format is missing things.

I'm using react and typescript.