Gudis Project Fields (FREE)

This app lets you create custom fields of the project level which can be later used in JQL expressions.

Available custom fields types are: text (you can search by words in JQL), string (you can search by exact match), number, user (you can search by user id in JQL), date, datetime.

To create a custom project field go to cogwheel item -> App -> Gudis Project Fields

To set values for custom fields for each project go to Project View in Jira Cloud and choose the Gudis Project Fields menu.