public readonly struct PortReference : IEquatable<PortReference>

Obtain a PortReference from Context.GetPortReference, providing the unique identifier of the port. The reference is only meaningful for the PortReference.Context that produced it. You can use its methods to set, retrieve, or clear the port preview for that specific port in the graph canvas. Port preview is a visualization feature that displays a label next to a port in the graph canvas. This label provides additional information about the port's value or state. Two PortReference values are equal when they share the same PortReference.PortID and refer to the same PortReference.Context instance.

Additional Resources: PortReference.Context, Context.GetPortReference

using var context = Registry.CreateVisualizationContext(graph.ID);context.GetPortReference(portID).SetPreview("42.0");if (context.GetPortReference(portID).TryGetPreview(out var displayValue))    Debug.Log(displayValue);context.GetPortReference(portID).ClearPreview();