I think it’s probably JST PH2.0
To confirm check the distance between pins, it should be 2mm like this:
If it is JST PH2.0:
MBoards has pre-made 200mm extensions here:
Or you can crimp your own if you have a crimp tool,
Applicable info here:
No worries, there’s a learning curve. For future reference the Beginner Question Thread is a great place to ask questions like this.