How to use App Version in config.xml when performing a Pro.init

I’m developing an Ionic Pro app. During the initialization of Ionic Pro in app.module.ts, I am required to provide an app version like so:

Pro.init('<APP_ID_PLACEHOLDER>', {

However, instead of hard coding the app version in the app.module.ts file, I’d like to use the app version in config.xml.

Does anyone know how that can be done?