Could you please fetch the WebView version from your Cordova and let’s see how we get Cordova to run a WebView that supports ES2020.
I wonder if you can enforce ES2020 for WebView via the modern browser Meteor package.
E.g.
import { setMinimumBrowserVersions } from 'meteor/modern-browsers'
setMinimumBrowserVersions({
facebook: 325
}, 'minimum versions for ECMAScript 2015 classes')
I think the problem is now known we just need to find a solution: run a WebView version that natively supports ES2020 or later.