Dynamic Markings for the User Currently Accessing the Document

Hi all,

I was interested in creating a label that has a watermark with the user currently accessing the document and the current time. This will help the org know who leaked the information if it was to spread outside the org (similar functionality as Seclore). It seems Purview can do dynamic markings, however it seems it's all related to who applied the label and when it was applied, not who is accessing the file now. 

Here is an example of Seclore's watermark:

Any way to accomplish this in Purview?