HelixToolkit change BillboardTextVisual3D origin

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Normally when we create a BillboardTextVisual3D it's origin is in its center. Is there any way to change this? The position is defined in world coordinates and I would like to offset the billboard in screen coordinates.

To be more exactly I'm trying to achieve something like this:

enter image description here

I have the world position of the red dot, which is the position that I'm using to draw the green target billboard. I would like to show a text below it with its coordinates (blue billboard), which would be another billboard that should be positioned right below the green one.

Is there any way to achieve this?

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