Number of participants currently in the route, e.g., show "2 / 3 ready" in UI.
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 CurrentParticipants = 0;