The code is based on the sample project for the "Widgets Code-Along" video series of Apples WWDC20:

https://developer.apple.com/documentation/widgetkit/building_widgets_using_widgetkit_and_swiftui

I started with the "part 1" project and went on with my own code.

The following differences are note worthy:

• the DynamicCharacterSelection intent is "shortcut app"-enabled
• when visiting a character detail page, the corresponging Siri intent is donated (enabling the siri based surfacing of widgets)
• when a donated intent is selected later again, the app is handling this NSUserActivity and opens the details screen.

Here follows the regular README:

Create widgets to show your app's content on the Home screen, with custom intents for user-customizable settings.

• Note: This sample code project is associated with WWDC20 session 10034: Widgets Code-Along, Part 1: The Adventure Begins; session 10035: Widgets Code-Along, Part 2: Alternate Timelines; and session 10036: Widgets Code-Along, Part 3: Advancing Timelines.