I recently started with Paperless-ngx and wanted to also include archive serial numbers (ASNs) for all paper documents using small label stickers, so I built a small tool to create and print ASN label sheets. It's free, no sign up, no ads and just runs in the browser:
https://asnlabels.com
If you're also using Paperless-ngx with ASNs or use them for something else, feedback welcome :)