Programmatically retrieve list of supported WiFi frequencies/channels

I'm currently building an application that leverages NetworkManager for providing network configuration functionalities. The application uses the DBus API to communicate with NetworkManager. I'm now stuck on the following problem: I want to have a UI element that lists the WiFi channels/frequencies that the user can select when setting up a WiFi access point but I'm not able to find a way to ask NetworkManager for this information. If I understand correctly the supported channel/frequencies depend on the network card capabilities and the country code set for the system. When I use nmtui the channel selector is a text box and when I select an unsupported channel it throws an error. It looks like this information is available somewhere but I can't access it. I know that I can retrieve this info from iwlist but, as per their documentation, that command output is not meant to be parsed and is not stable. I tried skimming through the wpa_supplicant DBus API but it doesn't seem to provide this information either. Is there a service/API I can use for retrieving this information?