I have done it two different ways and both were great.
The first time (several times) I took the crushed pineapple from the rind and added a good amount of sugar (maybe 1/4 cup). I didn't wait, I didn't boil it. I just used it and it tasted good.
The last time I used pineapple ice cream topping (ingredients are very close to preserves). I added fresh pineapple ("crushed" from the rind again) for texture and because the ice cream topping is soupier. It too was great! In fact I think it was better than what I had been doing before.