Never used C++ before but managed to get it working 
Thanks Fireapache! 
USkeletalMeshComponent* skelComponent = Cast<USkeletalMeshComponent>(GetOwner()->GetComponentByClass(USkeletalMeshComponent::StaticClass()));
UAnimInstance* animInstance = skelComponent->GetAnimInstance();
TMap<FName, float> tMap = animInstance->MorphTargetCurves;
FString value = FString::SanitizeFloat(tMap["BrowsD_L"]);
GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Red, value);
I put the code in an Actor components tick function and added the component to the skeletal mesh