If the four center pads are GPIOs, then you can put a single 0.45mm via (0.2mm drill) in the middle of them and tie them together. That gives you one extra pad

If the four center pads are GPIOs, then you can put a single 0.45mm via (0.2mm drill) in the middle of them and tie them together. That gives you one extra pad at least. I’ve done this before with JLCPCB’s regular process.