I have spent a lot of time trying to understand how to setup cache for json and API requests in Cloudflare lately and finally i have made some progress. This is not a step by step guide but mostly a "notes to self" post so i can make some more sense of it all.
If workers are active on a route page rules are ignored. Took me a while to realize this.
Cloudflare only execute ONE page rule per request, so make sure the rules are in the correct order and you don't have any "catch all" rule at the top.
Also note that the above note is not applied to workers route, with workers the routes is matched by how detailed they are. I.e domain.com/test is used even if domain.com/* exist and the order doesn't matter.
After you know this it should simply be to set a custom page rule on the path you want to cache with the option
Cache Level: Cache Everything
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