Add additional password while using Google as Log-In

I have created my Plex Account using Google. Now, because of this data breach, I want to add a new (or maybe create, not sure) passwort just for Plex.

But in order to create a password I need my “current password” (which is not the one from my google account). How do I proceed here?

Thank you

You perform the password reset, as described in the email.