I suck at drawing, and the left "joycon" is turned. I think it was never supposed to connect to a grip from the sides like the switch, the area above the analog sticks is where you will get the grip connect. Somewhere here.
On a regular Playstation controller the grip between the two handles isn't directly connected from the side like the Switch. The connecting "grip" between the handles, isn't even in the middle, but the upper part. Look at the Dualshock 4 for reference. Makes perfect sense to unite them.
There is more than enough