No.

For that you can use the built-in ISR capabilities of the pages router.

I'm trying to do some component level server side data fetching and since I'm isolated to a component, I'm sometimes fetching the data multiple times on a page and need a caching mechanism.

app router fetch is perfect for this.

Component level server-side data fetching doesn't exist in the pages router.

Because data is only fetched in gSSP and gSP

Most headless CMSs have workaround sdks for this, using a second rendering, context and middleware.

Its super awkward and much easier in app router, but I was hoping to use fetch caching. I guess Ill have to use something else if you are sure its not usable. I don't want to store it on that Headless CMS context or create another context but I guess Ill have to.