"Framework7.request.setup" Alternative in V8

I’m planning on migrating several projects I have on v6/v7 to v8, one major issue I’m facing is the removal of the “Request” object, especially the ability to setup requests with default values and callbacks using “Framework7.request.setup”, so what’s the alternative when using “Fetch”?
If I cannot achieve this using “Fetch”, can I get the “Request” class to work on V8?