Either the company has agreed that all teams will follow the same workflow, then you do as described above, or each team owns their own workflow definitions.
JIRA actively makes this hard. To modify a workflow a user has to be a Global JIRA Administrator.
The whole design of JIRA is based around management. It's not really for developers, as much at is is for your boss. This explains why Atlassian can get away with the user experience being so bad - it doesn't matter because developers aren't the ones choosing it.