I can't seem to get Camera2D to function as intended (for a shmup)

So I know this should be a fairly common question, but after hours of research online, including this sub, I just can't seem to find an answer. Basically I want the camera to function like it does in Raiden Jet Fighters:

https://youtu.be/K7p2-pT934w?si=rZkzcVjojrasPgZ0&t=67

I've got the clamping down, but I don't know how to make sure the camera is constantly moving horizontally with the player like this. I'm fairly new to godot so any advice is appreciated. :)