Is there an existing issue for this?

• I have searched the existing issues
• I have read the guide to filing a bug

Use case

In quick_actions package, there is no method to getMaxShortcutCount.

Android.
You can get that count by calling getMaxShortcutCountPerActivity.
https://developer.android.com/reference/androidx/core/content/pm/ShortcutManagerCompat#getMaxShortcutCountPerActivity(android.content.Context)

iOS
Maximum: 4

People tend to expect every app to provide at least one useful quick action; you can provide a total of four.

https://developer.apple.com/design/human-interface-guidelines/home-screen-quick-actions#Best-practices

Proposal

Implement getMaxShortcutCount method for each platform based on above things.