Preheat the oven to 375 degrees F with a large baking sheet on the lowest rack.
On a lightly floured surface, roll out the pie dough into a circle about ⅛" in thickness and large enough to fit in the pie dish with some overhang.
Carefully transfer to the pie dish, ensuring it is nestled up against the sides and corners. Fold the edges of the pie over and gently press to seal. Place in the fridge while the filling is made.
Chop 170g (1 ½ cups) of pecans and spread into an even layer along with the chocolate chunks into the pie dough.
Crimp the edges of the pie dough as desired, then place back in the fridge.
In a medium bowl, whisk together the caramel sauce, flour, brown sugar, salt, eggs, and vanilla until fully combined.
Pour the filling over chopped pecans and chocolate, then arrange the pecan halves on top.
Place back in the fridge one last time for about 10 minutes to ensure the crimp holds its shape in the oven.
Place the pie on the hot baking sheet in the oven and bake for about 40-45 minutes until the edges are golden and the filling appears set.
Allow the pie to set for at least two hours or overnight.