3D point cloud labeling, (Annotation on a particular x,y,z coordinate)

I wanted to label a 3D point cloud based on its features by attaching a number or an alphabet. i have located my ROI but I need to label it.

Answer 1

[Rik]

According to the documentation of text you can insert a text at a 3D position.

Answer 2

[SALIHU ABDULKADIR]

Thank you so much