Automatic and dynamic transclusion of text

Hi,

I need my notes entered by dates, and would like the possibility to mark some text for inclusion in a given page, but not simply by copy pasting. I'd like the inclusion to be automatic, and dynamic, so that if I change the text in one page, it changes in the other.
I'll give an example.

Page in calendar
dd-mm-yy
some text not that interesting.
{I have started text on this @SpecialTopic and it ends now.}
Some more text.

Special topic page

I'd have some code like include:@SpecialTopic
This would mean that any section of text, in any other page of the notebook, within a pair of {} (or any other delimiter obviously) also containing the tag @SpecialTopic would automatically appear in this page.
This inclusion would be dynamic, if I modify the text here, it changes in the calendar, and vice versa.

I've read about transclusion, and this would be one way to implement it, if it could be automated.

Is this possible?

Thank you