Customize post header (adding external shortcode / creating new tagDiv element)

Hi,
I am trying to add some custom code in the header of posts but I am not getting it.

The idea is to show the share buttons on the meta info module at header posts (at the same line as the author, date and the number of views) like this: https://wetransfer.com/downloads/97a6ed20f76efeaf357d3cc3d4e9548f20191218190955/374b39/preview/fc5fa00cd1b8ee1f25223d742758de7d20191218190955

How to add custom code in the same meta info module at header posts?
or How to create custom tagDiv element to put in there?

Thanks Calin,
I have tried but I have not been able to reach a good result.
I loaded a “single post template” from “tagDiv Cloud Library” and edited it with “tagDiv Composer” but I couldn’t add the custom code of “addtoany” on the same line as the author, date and number of views, inside the module ” meta info “in the header of the posts. It is not possible to insert custom code on that same line.
I gave up that idea and reloaded and edited a “single post template” of “tagDiv Cloud Library” with “tagDiv Composer”, this time without trying to add custom code, simply dragging and dropping elements and configuring them. I reached a point where I am in compliance, it is not what I wanted but it is not a disaster, the problem is that now whatsapp is not shown as an option to share, which does happen when I use the post template that comes by default.
Why is the whatsapp share button not showing? How do I add this button to the “single post template” that I am editing?

Thanks a lot.
Your explanation has been very useful.
thanks!