The actor, who has been with the soap since 2004, promised that there are huge plans afoot for Emmerdale in time for its 40th anniversary in October.
Miles told Inside Soap of the upcoming milestone: "I think there are going to be some big fireworks coming up - we've got some massive storylines on the way this year, so I'm sure Jimmy will be able to crowbar himself into one of those!
"I've had a hint of what I'm going to be doing [for the anniversary], but I can't tell you yet - a lot of it is to do with Carl, though."
Miles also revealed that he wants Jimmy to start standing up for himself more in the coming months.
"I would like for him to be a bit more assertive with Carl - and I'm trying to get that written in," he explained.
"When I was turning on the Christmas lights in Lincoln, a fan said, 'Are you as soft as Jimmy?' It was an awful thing to be asked, as I don't think of Jimmy as being soft. I avoided the question like a politician, but it really made me think."
Emmerdale continues at 7pm on ITV1.
> Emmerdale couple to be hit by 'blast from the past'
> Emmerdale Nicola Wheeler: 'I steal a lot of my wardrobe'
> Read more Emmerdale spoilers and news