LinkedIn does not include many formatting options for posts. You can add links, which results in a link title and description, which you can edit as needed.

Can I Make a Blogger Post to LinkedIn?. If you maintain a blog related to your industry or profession on Blogger, adding it to your LinkedIn profile gives you an avenue for promoting your blog and ...

LinkedIn wants to keep visitors on its site. Therefore it penalizes posts that drive people to other sites. You can always add an outside link it the comments: then you won’t be penalized.