Admob allows to send custom property values ​​for direct campaign delivery, for example a weather app wants to deliver a banner when the temperature is below _X_ degrees.

Bundle extras = new Bundle();

extras.putInteger("temperature_now", 9);

AdRequest request = new AdRequest.Builder() .addNetworkExtrasBundle(AdMobAdapter.class, extras).build();

Is there any specific reason why the functionality of sending custom fields for direct campaigns has not been implemented?