Perhaps OP is tall and big then he'll probably handle the volume. It's best to divert anyway but if one want to max out your intake with a single ingredient, Tempeh is the way to go: 15-20gr/100g. I'm a skinny guy and can eat 500gr of those in the day with ease, although it's also full of fibers and level up satiety as soon as you start digesting.
But if cheakpeas your only food source, 7/8 seems achievable. Ask the "carnivorses" that says plant left them hungry :-p
The average person is going to have a hard time getting through two cans of chickpeas, which are some of the highest almost complete protein sources when it comes to beans and legumes. As you can anecdotally see with most vegans it’s almost impossible to get the required protein using that diet. Even Indian cuisine, which is the closest humans have come to perfecting vegetarian dishes, heavily, heavily supplement with dairy products to make up the deficit.
Then don't exclusively get legumes via cans of chickpeas? It's just a weirdly specific and inconvenient strawman you've latched on to. Rice and beans, lentil soups or curries, black bean burgers, seitan, tofu, nuts. There are just so many ways to get enough protein (with "enough" being "way less than most Americans get").