Is it possible to add a license feature to make licensing works easier in LibreOffice, say by way of the license chooser which is in beta at: https://chooser-beta.creativecommons.org/ ?
This is akin to “Is it possible to integrate my own work/book/article favourite skeleton into LibreOffice so that I (not the others) can create my documents with more comfort?”
The answer is obviously “No”: Writer, and LO as a whole, is a general purpose tool supposed to cover the needs of billions people. Developers cannot guess all the possible needs and, anyway, such a tool would be tremendously “heavy”, probably unable to load even in giant computers.
However, I imagine that you are working with a single licence or a restricted number of licences.
You can then incorporate the text of this/these licence(s) in user templates and select it on document creation or make it your default template if there is a single licence.
This is the way I do it.
For the slightly variable elements in the licence statement, like the year for ©2021 or author’s name, I add them with field insertion paired with File>Properties custom properties. This is an example of a document of a friend of mine based on one of my templates:
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