Jetway replacement ( at default airports only, which is the only case where jetway replacement should be used ) in GSX in MSFS is not dynamic or reacts to the airline assigned to the parking, because it's done by using pre-made airport .BGL files containing only replacement jetways for all the default airports that originally came with some jetways.
This means, their assignment is fixed, which is very different than FSX/P3D, where we bypassed the default jetway system entirely, and could created them dynamically, with SODE.