That crossed my line of vision while looking at protein concentrations of beans and grains in general.
We're making our own protein powders for post-workout recoveries, and plan to try some bean and grain combinations. I'm finding these particular references convenient and informative...
https://www.myfooddata.com/articles/beans-legumes-highest-protein.php
https://www.thespruceeats.com/protein-content-of-gluten-free-grains-1451326
And hemp seeds aren't the highest in protein, but apparently something to consider?
https://draxe.com/nutrition/supplements/hemp-protein-powder/