But how many apples?
I was a bit concerned that too many would overpower the flavour of the chillies and give a 'hot' apple jelly. So, belt and braces - no harm done.
BTW when I used to make fruit wines there were some fruits so high in pectin that pectolase had to be used to neutralise it otherwise an unshiftable haze formed. Apples and gooseberries spring to mind.