Azure Functions V3 proxy with parameter in domain

Azure Functions V3.

When I register the proxy rule like this:
```
{
"$schema": "http://json.schemastore.org/proxies",
"proxies": {
"Proxy name": {
"matchCondition": {
"route": "/link/{value}"
},
"backendUri": "https://subdomain-{value}.westeurope.azurestaticapps.net"
}
}
}

```
it throws 404. I suspect this happens because the parameter {value} is being used in domain part of the backendUri.
Is it possible to achieve this functionality?