Extend PL/pgSQL

I am in workplacement in a company and I have to make a migration from one database to PostGreSQL. Nevertheless, the migration is not possible, because I don't have the GOTO instruction. I know this is a bad practice, however, I wanted to know if it's possible to implement this feature. If it's possible, I wonder if a developer could add this feature. Thank you in advance, send me an email if you have an answer.