Happened to me. You can pull the cowl plastics and get creative with some zip ties for a temporary fix but you'll be back in there again in 6 months.
You'll end up breaking clips so go ahead order these ahead of time:
https://www.amazon.com/gp/product/B006OCTUG8/
The real fix is to order and install the whole wiper assembly. Thankfully it's a relatively cheap part.
https://www.amazon.com/gp/product/B0080B3Z44/
As for installation, it's seriously some voodoo. The engineering that went into making sure it can be slid into place is beyond me, but it does somehow fit. To say it's fiddly is an understatement. Pay very close attention to the orientation of the existing assembly when you manage to remove it because the new one has to go in the same way. I didn't, and the 20 minute job took me 2 hours of twisting and turning and pushing and cursing.
Seriously, it's only a 20 minute job if you can quickly figure out how the assembly slides into the cowl. It comes out and goes in from the driver's side of the truck.