Great, you have a goal.
Your seedling is still many years from reaching this stage, however. It's always difficult to judge measurement online, but I'd say the trunk on that tree is about 1/2-3/4, probably smack in between at 5/8". In ground, left unfettered, with no clipping chopping, what have you, your tree will need probably a minimum of three years to put on that girth. Five years is probably more realistic if it's not "pushed" (lots of sun and ferts, well drained soil). That's if you just pop it in the ground and do nothing else. Then, you'll need to chop and wait two more years, minimum, and repeat, before you can even think about primary branch placement/movement.
IF you go the clip and grow method, pruning all the way, as I said earlier, you'll acheive your goal this side of never. Likely, it will take 15-20 years using that method before you can acheive your goal. If that's okay with you, great, and I happen to love clip and grow trees. But you should know that you're in for the extreme long haul when working clip and grow on a potted tree, especially a JM. Likely, you won't get any nice bark either, not until maybe the tenth year or so.