We ran into some dependency conflicts and therefore migrated this ionic native plugin to the awesome cordova style. However, this is not an official plugin and you are probably better off switching to Ionic Capacitor.
To use it simply install via npm
npm i @pragmatic_apps/google-maps
More information:
Awesome Cordova Repo: https://github.com/danielsogl/awesome-cordova-plugins
Ionic Native Google Maps Plugin: https://github.com/ionic-team/ionic-native-google-maps