How can I wrie a PLY file that includes vertices and edges (line segments)

[KevinWang-kk]

Like:
ply
format ascii 1.0
comment Created in Blender version 4.2.2 LTS
element vertex 9
property float x
property float y
property float z
element edge 8
property int vertex1
property int vertex2
end_header
0 0 0
2.8578901 0.5062549 0
1.061502 1.649411 0
-0.5715781 0.68589365 0
3.0538597 -1.1268252 0
1.3554564 -1.4861028 0
-0.048992634 -0.9635172 0
4.519225 -1.5217007 -0.061250053
5.1182466 -3.1931024 -0.88823277
4 5
1 4
1 2
2 3
0 3
5 6
4 7
7 8