How to create a custom page

Hi,
I just started learning
Plasmo
yesterday.
I started using the
with-nextjs
example.

How do I create a custom page?
Like: I want to create
chrome-extension://my-extension-id/oauth/callback


I tried creating a
index.tsx
file in
src/tabs/oauth/callback/index.tsx


But that doesnt seem to work.
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