What does Zoro wants from Vegapunk?

Some say it is to heal the adverse of effects the SMILE fruit because Zoro felt bad for the suffering of Wano's citizens and respected Yasuie a lot. We could say Wano was Zoro's arc and WCI was Sanji's.

Some say it is to heal his right eye or give him a robot one.

Some say it is related to Kuma as he might have told Zoro something that no one else knew during their alone encounter during Thriller Bark. Remember he knocked out Sanji who was the closest within hearing distance to anything they spoke of. He was also sent to Mihawk and ontop of that was the first member to see Kuma when he got to the Sunny Go.

Maybe even create a real dragon like the one they saw in Punk Hazard but more in terms of difficulty to the one Ryuma faced? Or perhaps something else related to Ryuma or his backgroumd? Seeing as we did not get to explore as much as we did with Sanji's in WCI arc.

Or perhaps something related Tashigi being Kuina, she might have lost her memory after her accidnet? She's with the SSG and they have probably been in contact with Vegapunk.