Hello Florencen - I know of no group that has indexed the burials at Mt. Jerome. However what I have done is firstly (1) check the Family History Centre, Mormon Church. (you can do this on your computer) Go to cemeteries of Dublin. Check the year you are interested in. Years are from 1832 to 1900 or somewhere around that area. When you find the year, there will be a film number. Write this down. (2) Go to your nearest Family History Centre & ask to order the film. When the film comes back, they will contact you & you can go through the film until you find your family members. Take a copy. There will be the names, what year they died, a registry number, subdivision number & the registered number of this grave. (3) Write to the Mount Jerome Cemetery at Mt. Jerome, Harold's Cross, Dublin 6 & ask them for a memorial inscription of this grave, giving all particulars. This is free of charge. You may be able to order the death cert. as I found out later after they sent me a map of the cemetery & particulars of each person in that plot. This is the only place to enquire about a death cert. if they are buried in Mt. Jerome. As far as I know they have no email address. I also have a phone number if you wish to phone them after you have the particulars of the grave site to save time in writing.
Hope this is helpful. If you need any further info just let me know.