@tabstop,
You have to just create simple product attributes.
Admin -> Stores -> Attributes -> Product
create new shipment_status attributes and keep Catalog Input Type for Store Owner as Text field.
Now set your custom attribute into Attribute sets.
Now assigned your dynamic value from product level at backend.
Now you can get your product attribute value in product page.
If response was helpful to you,Consider giving kudos to the post.
If issue solved, click Accept as Solution.