I make rowan jelly...but not just on it's own. I make a 'hedgerow' jelly using crabapples, rosehips, quince and whatever else comes to hand. If you come across a John Downie crab or small tart Dabinet or 'catshead'cider apples, they will provide the pectin you need for a good set. Additional redcurrants, blackberries, bilberries or wineberries (any of the ribes or rubus tbh) also adds a lovely claret colour. They are not really a faff - just takes time (to simmer until very soft...up to an hour) and patience, to strain without meddling. Squeezing, while satisfying, will cause loss of clarity. The resulting jellies range from pale pinks to deepest burgundy and make lovely gifts if packaged nicely.
For rowan enthusiasts, some varieties make much better jelly. S.commixta is my favourite, made with malus hupehensis or malus transitoria crabs. Same with roseheps. The large rugosa heps, along with briar eglantines and r.pomifera make the best rosehep jelly...but these are really just for boasting and pretentiousness. In truth, a decent hedgerow jelly can be made out of any varieties...although I admit to being a bit less enthused with berries grown along main roads or at dog-pee height.