Install capacitor plugins

Capacitor plugins are installed via git submodules

git submodule add https://github.com/ionic-team/capacitor-plugins.git Vendor/capacitor-plugins

then File -> Add Package Dependencies -> Add Local -> add Vendor/capacitor-plugins/preferences (folder containing Package.swift)

On Portal init, import the plugin and add to the portal's plugins list: See ContentView.swift for example:

import PreferencesPlugin
...
plugins: [.type(PreferencesPlugin.self)],