How to rotate around an arbitrary point?

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Here is my solution to it. It will rotate the object around the given Pivot using the objects own rotation. E.g. A delta rotation around Z will rotate around the objects Z axis. Optionally you can retain the rotation of the object itself.
You can write this as a function, for sure.

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	UFUNCTION(BlueprintPure)
		static void RotateAroundPivot(const FTransform& Original, const FVector PivotLocation, const FRotator DeltaRotation, bool bRetainOrientation, FTransform& New)
	{
		FTransform PivotTransform = FTransform(Original.GetRotation(), PivotLocation);
		FTransform DeltaPivotToOriginal = Original * PivotTransform.Inverse();
		New = FTransform(DeltaRotation.GetInverse() * (float)bRetainOrientation, FVector(0,0,0)) * DeltaPivotToOriginal * FTransform(DeltaRotation, FVector(0,0,0)) * PivotTransform;
	}