Refreshable Control in LibreOffice Writer

Hello Team,
I am working on developing an Addin for LibreOffice in Java.
I am actually looking for a control where I can display some text/table from server to user and store the metadata( server information) to its custom content/property.
The idea is to refresh this content after subsequent opening of the document.
I have Content control in Microsoft Word for this and i store information in the custom properties of it.
Since we don’t have content control in LibreOffice writer , can you please guide me for an equivalent control for this.

Here is my environment details
LibreOffice Version: (x64)
OS: WIndows

Maybe property “Tag”, but, I don’t now what is “content control”.

Hi, thanks for the suggestion. Can you please point me to any example or a page explaining on how to add this “tag”