This webpage allows you to convert the CSV file from Libreview to a format that can be imported into the Health app on iOS.
No data is submitted to a server, it's converted in your browser.
You can use (not sponsored or affiliated)
Health CSV Importer on the App Store
to import the converted CSV file.
N.B.: The tool does not take into account existing data in iOS Health and neither does the mentioned importer. You might need to delete existing data in iOS Health before importing.