This is possible by using the Product Variant Feature.

Activate it in Settings:

You can then create a single Attribute with a single FREE TEXT attribute value.

Add the text description each time and it will show on the Sales Order, Delivery Order, Invoice, Customer Portal and all PDF reports.

Sales Order / Delivery Order / Invoice:

Customer Portal:

PDF Reports:

Note that here both the Attribute and the Attribute Value are defined with a name equivalent to a single non printing character (Zero Width Space - ZWSP Character) that I copied from https://coolsymbol.com/zero-width-space-joiner-non-joiner-ltr-rtl-lrm-rlm-characters-symbols.html