How to link Facebook/Meta login with Shopify App for Store Admin?

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Hi,

I'm trying to add login for my new Shopify App, which lets the Store Admin, NOT the customers, login with their Facebook/Meta account.
I have the part where I log them in and get the Meta access token, but I was wondering how can I easily save the access the access token and link it to the current store's admin, to always make sure that they are logged in to their Meta account.
Any ideas?

Also, the way I currently log them in is not perfect and requires a new tab to be opened to access the Meta login URL, any ideas on how to improve this behavior?