This is the method that you are looking for if you are using Jira on Cloud.
But if you are using Jira Server/Data Center this method doesn’t exist.
You must follow the next flow by api rest:
1. Get the issuetypes of the project.
2. Create a new issuetype scheme with the issuetypes that you have got plus the new ones that you want to add.
3. Associate the new issuetype scheme with the project.
4. Delete the old issuetype scheme if you can and want to.
I hope I have helped you.
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