Great news from @lynxis in OpenIMSD:
"I've written a profile manager for the QCOM baseband which talks to the PDC service.
The PDC is the persistent device configuration. It controls similar settings as the carrier configuration on Android, such as the APN, SMSC, the IMS functionality, the 5G functionality, ... But the PDC profiles have more control over the baseband than the Android carrier configuration does."
Full blog post:
https://www.openimsd.com/09-qcom-baseband-profile-manager.html
Source code:
https://gitlab.postmarketos.org/modem/openimsd/qcom-baseband-profile-manager