Limbo.Umbraco.MultiNodeTreePicker adds a special multinode treepicker to the Umbraco backoffice in which developers can select a custom item converter.
The purpose of an item converter is to control the C# type returned by the .Value() method or the corresponding property in a Models Builder generated model. This is particular useful in a SPA/Headless Umbraco implementation, where the Models Builder model can then be returned directly via an API endpoint.