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Check pyside6-uic -h and you will see two options that might help you:
--from-imports Python: generate imports relative to '.'
--absolute-imports Python: generate absolute imports
--rc-prefix Python: Generate "rc_file" instead of
"file_rc" import
--star-imports Python: Use * imports
--python-paths <pathlist> Python paths for --absolute-imports.
Maybe some of those solve your issue?