As with most peninsula kitchens, chances are it will be tight to turn it into an island kitchen. If you post your layout (aerial view) with exact measurements of the room (doorways, windows, openings to adjoining rooms included) and existing cabinetry, you will get the input you need to determine if you can move forward with that goal :)

42” of clearance for a one worker kitchen. 48” for a two worker one. Note that that is measured between the thing that sticks out into the aisle the most. Like the fridge, below. That accurately measure the most restrictive point. Not the most generous point.