在我的原型文件中将google.protobuf.Struct用于动态json时出错

Question

I am using the below message in my proto file as an example,

message Report {
    string name = 1;
    string desc = 2;
    google.protobuf.Struct criteria = 3;
}

and generated the go client, server code. When passing the json below

{
"name": "My Report",
"desc": "My first report",
"criteria": {"fields": {"sum": "100"}}
}

as post request body to an endpoint and unmarshalling using

import  "github.com/golang/protobuf/jsonpb"

var u api.Report
if err := jsonpb.Unmarshal(r.Body, &u); err != nil {...

I keep getting this error:

level=info msg="panic: reflect.Set: value of type map[string]*structpb.Value is not assignable to type map[string]*structpb.Value"

I have also tried using gogo/protobuf/jsonpb but no success there too, although I am still importing in my proto file.

import "google/protobuf/struct.proto";

Not sure what am I missing here.