Marketing Cloud Next: link name to identify different CTA in report

Hi everyone, 

I sent an email from Marketing Cloud Next and the Link Name column in the email engagement report is empty for my CTA. I’d like to understand how to correctly set a link name so that each CTA can be identified in the report. 

Scenario 1: Custom HTML

I imported custom HTML where the CTA is a standard anchor with an alias attribute: 

html

<a href="https://example.com" alias="CTA_Book_Appointment" target="_blank">Book an appointment</a>

The link is tracked (the URL is rewritten), but Link Name is blank in the report. 

• Is the alias attribute supported in Marketing Cloud Next, as it is in Marketing Cloud Engagement?
• If not, is there another attribute or syntax for custom HTML?
• Are there limitations (for example, anchors inside conditional comments such as <!--[if !mso]><!-- -->, or VML buttons for Outlook)?

• Where exactly can I set the Link Name when I use the platform’s builder components (button, text link, image link)? I can’t find the field in the properties panel.
• Is it mapped to ssot__LinkName__c on the Email Link Click event, so it shows up both in the report and in Data Cloud?

• Is there any delay before Link Name shows up in the report?
• Does the link name need to be unique within the email?

I couldn’t find official documentation for Marketing Cloud Next on this, only the Engagement docs on link tracking. Any pointer to the right documentation or a working example would be greatly appreciated. 

Thanks!