Hi Terry,
Thanks for asking; I appreciate it when folk look for feedback and I wish you well in your work - to me it shows wisdom and compassion to ask how you can be of service.
It is probably fair to say that you have landed on a forum which is largely anti jw and if any of us were unfortunate enough to need your services (if you see what I mean) we would probably be grateful for your interest at what would be a very scary or even terrifying time.
Devout jw's will be just as scared as anyone else knowing they are to die soon - often though they will have elders and congregation members who will visit regularly - they likely will not want your services for the reasons highlighted by several posters already.
Other jw's will be lonely - maybe their family are not jw's or are even disfellowshipped jw's and they would love some companionship but might be fearful of engaging with anyone who identified as a clergyman by the way they dress.
It truly is a minefield and I would simply suggest offer a warm smile, ask if there is anything you can provide or if they would like you having a chat with them and not feel rebuffed when they refuse.
Thanks for posting.