ther is no standard for com port over BLE but it could work with something like https://github.com/Jakeler/ble-serial if bangle would make gps serial available over bluetooth as one of those ble serial adapters (like HM-10) which is quite easy.
However I guess the data received from that password protected agps service could be simply written to the gps as is. But still that GnssToolKit3 tool could be interesting to use.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
ther is no standard for com port over BLE but it could work with something like https://github.com/Jakeler/ble-serial if bangle would make gps serial available over bluetooth as one of those ble serial adapters (like HM-10) which is quite easy.
However I guess the data received from that password protected agps service could be simply written to the gps as is. But still that GnssToolKit3 tool could be interesting to use.