In order to add a field to the screen in Jira, please follow the steps:

• Go to selected project page and select Project Settings option in the sidebar navigation:
  
  
  
  
• Next, select Screens in sidebar navigation:
  
  
  
  

• On the Screens page, click a name of a screen that you want to configure (depending on the operation and issue type), e.g. a screen for Create issue operation:
  
  

  You can also see the list of all screens available in Jira by going to Jira Settings > Issues > Screens page.

  
  
  

• On the Configure Screen page add a field (e.g., Checklist Content YAML) to the list:
  
  
  
  

• Test your setup: go to the Create Issue page and spot the Checklist Content YAML custom field available on the list: