(enhancement) Allow to paste the subscribe-to-push-notifications checkbox inline on a page

[vitalii-work]

Problem

Currently, a user must click/tap the bell icon to manage the subscription status of push notifications. It is often a UX problem because on many websites we have another floating icons from different services (chat, cookies management, etc).

Solution idea

@rwngallego I will donate more if you implement something (probably both a code-based solution + a shortcode-based solution) to paste the subscribe-to-push-notifications checkbox inline on a page.

This is how I would use it:

1. We have a plugin for user registrations from frontend. And that plugin has add-ons for on-site notifications and private messages.
2. A a regular user I would go to Account — Settings — Notifications tab, where I see options for enabling on-site notifications for different scenarios.
3. For example, "Notify me when someone sends me a message":
   [ checkbox from the on-site notification add-on ]
   [ checkbox from Perfecty Push Plugin ] (nice to add it here)

To achieve this, I would ask a developer to add the checkbox from Perfecty Push Plugin to the template responsible for rendering the Notifications tab.

P.S. If there's already a way to do this, please, let us know.