I didn't develop a tool but I did figure out how to use "Configure Pop-ups" on a layer to work as a hyperlink tool - hope this'll help anyone looking for the old ArcMap desktop hyperlink tool in ArcGIS Pro.
In the Contents pane, right-click on the layer to be hyperlinked and click on "Configure Pop-ups." Click on the Image icon along the top, which will add a new line below Fields as shown below.
Click on the pencil to edit the newly added reference. Give any title. I'm going after utility as-built mapping so I called it "View As-built." Then, don't ask me why, but under both Source URL and hyperlink I had to add the URL (similar to ArcMap's "Map Document Properties" Hyperlink base: value. So it's the path to where the document is stored, less the file name (i.e. https://www.myserver/myfiles/" or in my case, since I'm opening a pdf document within my domain its \\myserver\myfiles\"). Apparently if you use the http reference it defaults to IE and you can't change this to something more stable such as Chrome.
Now add the field reference from the attribute table to your URL string. My field name is IMAGEPATH so I add it as {IMAGEPATH}. Click the Back arrow to finish your edits.
ID a feature and you'll get the ID window to popup and at the bottom will be your link (in the image below it's the black and white X - I imagine you can put in image in here to make it look fancy but who has time?).