How to map List c# --> proto3

Question

How can I map List of object from c# to message repeated from proto3 using AutoMapper?

var list = new List<Model>()
{
new Model() {Id = 1, Name = 
"something"}
};

cfg.CreateMap<ProtoList, List<Model>>().ReverseMap();

Proto:

message ProtoList{
repeated ProtoModel Model = 1;
}

I tried Serializing/Deserializing Protocol Buffers But this is not working for me