BaseTransformGizmo and PivotTransformGizmo

Anyone maybe used this in project:
BaseTransformGizmo blueprint class
PivotTransformGizmo blueprint class

???

What is purpose of this classes?

I cannot find any documentation about this.
I’m looking for a way to display gizmo handles at runtime with blueprint.
Please check attached pictures.

PivotTransformGizmo blueprint class
by default creates some basic geometry and much more components.

Thanks for any info about this.