How to set fallback value for which key contains dynamic id ?

[halfong]

Say here is a key with dynamic id:

const { data } = useSWRImmutable(/act/${aid})

And I want to set a fallback value( more likely a empty schema ) to all this kind of keys ( whatever the aid is ),
What should I supposed to do ?

<SWRConfig value={{ fallback: { '/act/???': { messages : [] } } }}>