Is there a function to parse a generic glib GVariant pointer into a const char*?

Such as the way it’s done in DBus?

signal time=1717768489.237441 sender=:1.22 -> destination=(null destination) serial=17 path=/org/bluez/hci0; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged

string "org.bluez.Adapter1"
   array [
      dict entry(
         string "Powered"
         variant             boolean false
      )
      dict entry(
         string "Discovering"
         variant             boolean false
      )
   ]
   array [
   ]