Sorry, I am late with the release. I worked on a server side solution for webmasters that want to use the custom share feature.
It's released here
It's an original idea of @crockwave

Where can we read some more stuff about this custom sharing feature?

@perflyst @tom79

The new feature hasn't been released to Google Play Store yet, but you can exercise it in Android Studio at the moment.

Start here with the Custom Sharing feature documentation in the Fedilab app at:

which shows you how to test against a sample site, e.g.

Then, you can look at the content creation management system that Tom created today, that uses the Custom Sharing feature, with more features and security, at:

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