How to lock or prevent conflicts for a new file with SVN

Hello,

We have a directory versioned in SVN and use svn lock to prevent
conflicts (of non-mergeable files). However, when I create a new file
and do svn lock newfile, then got error:

svn: E155010: The node '...\newfile' was not found.

When 2 users create and commit `newfile` at the same time, then one of
them has a tree conflict.
How to use svn lock for a new file? Or is there any other way to
prevent conflicts when 2 users create the same file and the same time?
See my SO question
https://stackoverflow.com/questions/79639066/how-to-lock-or-prevent-conflicts-for-a-new-file-with-svn/79640745
and workaround https://stackoverflow.com/questions/79639066/how-to-lock-or-prevent-conflicts-for-a-new-file-with-svn/79640745

If this functionality is missing, then consider it as a feature
request. But then, the bug
https://issues.apache.org/jira/browse/SVN-2507 may be a blocker of
such feature request.

Thanks
Andy