Add-on allows to configure 'Subtasks' section in issues. 

To configure Subtasks section go to Administrator menu/ Add-ons/ Subtasks section 

Choose projects and Issue types where you want Subtasks section to be shown. For each pare Project-Issue type you can adjust it's own view. To select fields to be shown press "Fields".

Field - select fields from issues

Field name - Optional, you can type in field name in your language if you want to rename the heading of JIRA field in subtasks section. If the field is empty default JIRA field name will be shown in heading.

Field name (En) - same as Field name attribute but in English.