[Gmsh] lines or points in plane surface

[Sebastian Langer]

Hello all,

my question has probably been asked before, but I haven't found
information about it in the archive, sorry!

I am able to add Line Loops to a Plane Surface and then mesh this
surface. In result I get a nicely meshed surface with holes in it. So
far, so good!

Now I would like to put lines or points into the Plane Surface, which
are used for meshing. I tried to create a Line Loop from two Lines,
which are connected to the same two Points, but it did not really work
(sometimes it won't mesh or overlap triangles)

Is there a way to add Points or Lines into a Plane Surface without
creating a Loop for them and these Points/Lines are still connected to
during the meshing?

Thank you, Sebastian