How to use automapper with grpc repeated types

I have the following google proto models

message PlatformsDTO
{
    repeated .cms.PlatformDTO Platforms = 1;
}
message PlatformDTO{
    string Code = 1;
    string Name = 2;
    bool IsActive =3;
}

and below class implementation of my platforms model

public class PLATFORMS
{
    public string Code { get; set; }

    public string Name { get; set; }

    public bool IsActive { get; set; }
}

what I would like to achieve is to map PlatformsDto's repeated Platforms property into List<PLATFORMS>

I would appreciate any help as I don't have any clue on how to do this..