Chrome extension: Run a function for specific website context?

Theres a specific website that has certain funtions that I’d like my Chrome extension to run whenever the page is active. Lets call this website website1

Website1 has function called enabled() that I’d like to run:

website1.enable()

Now to my understaning calling contentScript will run in its own sort of context and not website1 context. So calling website1.enable() actually results in below error

contentScript.js:2 Uncaught ReferenceError: website1

How can I call website1.enable() in its context?