I am wondering if there is a method by which I can designate a WLAN/WiFi connection as "mobile network" based on its SSID for the sake data usage policies by apps or the Android system in general.
Typically when you have a data plan with your mobile provider, your phone's LTE (or 3G ...) modem will connect to the provider to enable you to have internet access.
Now if I am using a mobile LTE/WLAN router instead, my phone assumes that it's on an unmetered WiFi uplink and apps/the system will (mis)behave accordingly.
Is there a way to tell the system that when it connects to a particular SSID it should treat that as "mobile network" in regards to how apps may use data?
Phone: Samsung S9+ (SM-G965F), Android 9
NB: the settings from this answer don't exist on my phone.