Authentication and Authorization with JWT without EF & Identity

Hi there,

I'm searching for tutorials / codesnippets / guide which tells me, how to implement JWT authentication without Identity and EF.
Also i need some informations in how to implement an authorization system which can be authorized down to a single action within a controller.

I have to transport a given user database with access rights which can be granted down to a single function.
E.g. a webform contains mutiple buttons. Each button can be authorized independently.

I want to have as few external components as possible, or components which can be extendet to fit my use.

PS: I'm talking about a .net Core 2 web-api..

Best regards,
Niko