Why don't admob fullscreen ads support in plugin?

I intergrated plugin for Admob in my game.
Banner show correctly, but I can’t see fullscreen ads.
So I saw source of PluginAdmob project and I find @“Now not support full screen view in Admob”.
Why don’t it support ?
If it’s impossible, I don’t need pluginAdmob.

Now I use cocos2d-x 3.6 version now.

Can you explain about it ?

Are you talking about interstitial ads?

Yes.
I mean interstitial ads for admob.

Well our Cocos Helper has AdMob built in with interstitial ads. We also provide video tutorials to ease the process. Feel free to contact us at support@sonarsystems.co.uk with any questions you have regarding the Cocos Helper.