No matter if the cable has broken, or you just want a spare lying around in case it does break, you might find this useful.
From Amazon
DJI Mavic Air 2 RC Cable (Lightning Connector) - Cable Compatible with Mavic Air 2 Remote Controller, Accessory for Mavic Air 2
Conrad Electronic
DJI Multicopter RC cable Suitable for: DJI Mavic 3, DJI Mini 3, DJI Mini 3 Fly More Combo, DJI RC-N1 Remote controller, DJI RC-N2 Remote controller