Move Folder - csproj and Nuget

I have a nuget getting created and Content folder getting created in the nuget. I want my files to not be in Content folder but be in the Test folder in that nuget. (So, user won't see files by default.)

How Can I move files from ContentFolder to Test folder ?

My csproj has :

<ItemGroup><Protobuf Include="*.proto" GrpcServices="Both" /><Content Include="@(Protobuf)" />  // If I remove this line - Content folder disappers, but I want to keep this data into a Test folder in my nuget</ItemGroup>