You can share a link to a Heatmap report with another person.

From your Matomo dashboard select Heatmaps > Manage Heatmaps. From the list of heatmaps select the View report (eyeball icon) from the actions, this will open the heatmap screen.

You then need to append a token_auth to the end of the URL such as &token_auth=the_new_token_here. As the token will be publicly visible you need to create a View only permission user. Please note that whoever can see the Heatmap report would be able to also access all of the Matomo data for this website.