I wanted to know if there is a way to find complete tabs. Many songs have only verse or chorus tabs but not both. I am interested in chord progression changes from verse to chorus.
There's no way to do this. I don't think there's even a feasible way of doing this. You have simple songs that are only 1 section long, while others have tons.
You can't just say whether or not a song is complete because there are so many that aren't. A vast majority of @HertzDevil's analyses are incomplete due to the exclusion of polyphony in TheoryTab.
So this is unlikely to be implemented.
False, it is rather due to the lack of motivation to do most analyses at Intermediate or below, but more importantly because many of those songs are not even on YouTube (and perhaps everywhere else due to copyright issues).