Triggering onAdImpression in the AD-Mob in android

What I am doing doing

• I have the below code where the AD is Displaying
• I am using google AD-Mob
• AD is displaying fine

What I am trying to understand

• onAdImpression() is not triggered when the view is rendered in the screen instead its triggered when I click the AD, GO to the designated AD and return back to the APP where the AD container is present
• Is it supposed to work this way or onAdImpression() should be triggered as soon as the AD is rendered on the screen

@Composable fun BannerAdView(adUnitId: String) {     val context = LocalContext.current     val adView = remember { AdView(context) }          AndroidView(         factory = {             adView.apply {                 setAdSize(AdSize.BANNER)                 this.adUnitId = adUnitId                 adListener = object : AdListener() {                     override fun onAdLoaded() {                         // Called when an ad is loaded.                     }                     override fun onAdFailedToLoad(error: LoadAdError) {                         // Called when an ad fails to load.                     }                     override fun onAdOpened() {                         // Called when an ad opens an overlay that covers the screen.                     }                     override fun onAdClicked() {                         // Called when an ad is clicked.                     }                     override fun onAdClosed() {                         // Called when the user is about to return to the app after tapping on an ad.                     }                     override fun onAdImpression() {                         // Called when an ad impression is recorded.                         Log.d("AdImpression", "Ad impression recorded")                     }                 }                 loadAd(AdRequest.Builder().build())             }         },         update = {             it.loadAd(AdRequest.Builder().build())         }     ) }