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My understanding is that this "active hyperlinking," as OSIsoft calls it, is a new feature in PI Vision 2017 R2. According to the User Guide, you can "use the value symbol to show the value of a data item on your display...If the data item stores a URL, then the symbol shows an active hyperlink in the display."
If you are using PI Vision 2017, the only way I know of to link is by right-clicking on text or a symbol > add navigational link and then manually paste the URL.
Hope this helps!