Some of our clients want this feature and we (Praxis) are willing to help contribute it.

We have created an example of a solution:
https://imgur.com/C0MOUpq

The LinkedIn icon will then when clicked on, open a new tab and automatically fill out the certificate information. (Using https://addtoprofile.linkedin.com/)

We've also added two new settings:
https://imgur.com/vS92fok

The first one is whether to show the button.
The second one is the id of the LinkedIn organization issuing the certificates, so that the button can also prefill that automatically in the add certificate form on LinkedIn.