Number of participants required by the route, e.g., hide waiting text when it is one.
This numeric value (int32) belongs to FInteractionRuntimeParticipantSnapshot under InteractionRuntime.
Blueprint or editor workflows can write this value when constructing, overriding, or customizing the owning object.
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "InteractionRuntime")
int32 RequiredParticipants = 0;