Preserve comments outside the root element of xml file

I am updating the xml file using python xml module and I want to preserve all the comments, using insert_comment variable is preserving the comments inside root element but removing outside/end of the xml file.

Is there any way to save those comments along with inner ones?

Below is the answers I found.

Python 3.8 added the insert_comments argument to TreeBuilder which:

class xml.etree.ElementTree.TreeBuilder(element_factory=None, *, comment_factory=None, pi_factory=None, insert_comments=False, insert_pis=False)

When insert_comments and/or insert_pis is true, comments/pis will be inserted into the tree if they appear within root element the (but not outside of it).

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