Hi SBLEAST,
There is a similar thread with a few examples of people who wrote their own and are sharing the JS code to realize the function to print an address label from a lead or contact record on D365 Online. While you still need to tweak it for the CRM js updates and Dymo SDK changes.
[View:https://community.dynamics.com/crm/f/117/t/177033]
Hope it would help.
Have a wonderful day.
Best Regards
Johnny