Backend/upstream slow start feature

Does istio have a slow start feature for the new backends like nginx has? - Module ngx_http_upstream_module

For example, when I scale some deployment, I want a ramp up period for the client and intra-mesh traffic to these new replicas.

Or maybe there any plans on this?

For the client traffic I can use ingress configuration to support this. But on intra-mesh traffic I have to rely on istio and didn’t find any way to in the documentation.