Azure APIM route the incoming request based on request URL

Question

I have a use case to route the request based on incoming url

where in API URL suffix - apples/grapes

Case 1: suppose an incoming request is

https://fruits.com/apples/grapes/rest

then I need to divert the request to backend url say: https://stores.com/a/g

I am able to achieve this by adding <rewrite-uri template="/"/? to inbound policy

Case 2:

suppose if the incoming request is

https://fruits.com/apples/grapes/rest/a/b

then I need to route the request to the backend url: https://stores.com/a/g/caps/locks

I am able to achieve this by adding <rewrite-uri template="@(context.Request.Url.Path.Replace("rest/", ""))" /> to inbound policy

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How do I achieve both the use-cases in the same operation? as the response would be different for both cases;

I am unable to filter the incoming request based on context.api.path; when I send the request for the first usecase I am getting 500: internal server error as apim is expecting url path after rest/