Urgent question about python-reactjs-firebase

I have a python code which gives me URLs as an output which I want to pass through firebase hosted react application to use. How can I pass my list of URLs through my react js code constantly even if hosted on firebase.
Should I save them to json and then host it to use as API? it would be very costly for me. SHould I run python in react js? How can I do it or new suggestions.