Villagers custom trades vanilla

I'm trying to do a villager trading hall, but I have some troubles with randomness of higher level trades. For example I want a mason to buy diorite and sell polished diorite.

I've found some villager generators online, but there are many options and all I want is to just pick which of the possible trades the villager will have — NO other differences from the original mechanics. Like if I'd be lucky with the trades roll, just without wasting a lot of time and resources for trying again and again.

Is it possible?

If yes — is it possible to plan his future trades without unlocking it? I mean to have an Apprentice with guaranteed specific trades when it level ups