Being able to view JWST from Far would be a great way to monitor it visually. Considering the large Sun-Shield which is very shiny also, I wander if it is possible to view it from far using Hubble or some other ground based telescope?
It depends on what you mean by "view".
See a dot of light in the sky? Yes, pretty much. After all, we expect to "see" its radio beam, don't we?
Resolve even large details (heat shield, solar panel)? Pretty much no.
Hubble space telescope is of no help either. At 1500000km distance, it would have a linear resolution of about 1km.
What we can see in regard to JWST is if it loses attitude control and starts rotating. We will be able to see periodic changes of its brightness. If this happens, we can pretty much consider it broken.