Abbreviate Numbers is only available as a custom field type. It is not possible to define general values or any other setting options.
Create and configure the custom field
To create and configure the Abbreviated Numbers custom field, you must be logged in as a user with Jira Administrator permissions.
Go to Settings → Issues → Custom Fields
Create a new custom field of type CFS - Abbreviated Numbers
Add name and description
Associate the field to the appropriate screens. You must associate a field to a screen before it will be displayed.
Abbreviated Numbers JQL queries
CFS - Abbreviated Numbers can be used in JQL. It allows you to search for issues that include custom field values. To find issues that include multilevel select picker values enter the "CustomField_Name".