Widgets operate locally upon the device upon which they are installed. Mac widgets relate to the Mac upon which they are installed and configured; similarly, iPad widgets relate to the host iPad. As such, Widgets are not cross-platform.
Apple does invite submission of comments and feature requests via its Product Feedback portal. If you would like see new or extended functionality introduced in future versions of macOS and iPadOS, this would be the most appropriate channel through which to direct your requests to Apple:
Product Feedback - Apple