You can get the Jira Cloud issue attribute names with the following endpoint:
https://[servidor].atlassian.net/rest/api/3/issue/createmeta?expand=projects.issuetypes.fields&projectKeys=[key del proyecto]
The property [Project key] You can consult it on the platform

The project ID in Jira corresponds to the Id of the EndPoint’s response. Save this value to parameterize it in the JSON configuration file.

projects > issuetypes > fields: In this location you will find the information of the fields
Projects > ID: Project ID
Projects > key: Project Key