Certificate transparency

Hi everybody, I’m looking for a solution to implement certificate transparency on my ionic/angular app.
I don’t much experience working with hybrid technology. I don’t have code.
The idea is to validate the certificate and show an alert when something happens, to say to the user the connection is secure.

Thank you! for any advice in this cases.

I am trying to understand your use case

Is it an android or ios app in capacitor? Then certificates might not matter. And maybe the browser is the most reliable thing to make claims on security insted of your app?

Is it pwa or spa web? Then it is a matter of an ssl certificate on your hosting site

In short: how do certificates relate to ionic and or angular in your view?