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Yes and no. You need to get wires from the shifters into the inside of the bars to the junction. There doesn't look to be a hole near the bar ends but if the internal routing for the hose is just a couple of open holes into the inside of the bar, you can do it with a couple of longer wires. If they're guided routing though and not open on the inside, you can't.
You'd need to have them in hand to be able to tell if it's possible
Newbie question, but will these handlebars work with the di2 bar end junction box?
https://www.bellatisport.com/shop/product/6388/Look_ADH1.2_Road_handlebar.html