Hey @Matias Bonifacino, you can't extend the SS2.0 modules using extensions unfortunately. I had the same issue when trying to pull extra fields for the cases.
Possible solutions include:
• Do it on the client side - you should be able to split the author name at the last space in the name (or the first) and remove that text
• Roll back to using SS1.0 on the module and then extend using normal processes
• Rebuild the cases module yourself in 2.0 to pull the info you want
• Ignore away best practice and just edit the SS2.0 modules using overrides (which is what I had to do in my case)