In the menu, tools, with the board on the screen, select mill outlines.
Choose CNC as output and generate drill G-code commands.
Mirror is important.
Here you see the 3.8 mm Z-drill deep back for drilling a hole. In the converter this is converted to a centerpoint with 8 laserdots around it.
You can leave the name of the mill file and copy it later on to c:\pcb_laser\pcb_laser_input.nc
It has to have that name to be the input file of the converter.