This release adds support for Live Chat custom fields in Custom Reports. You can now use supported custom fields as attributes to group and filter report data based on information collected through Pre-chat, Post-chat, Agent Wrap-up, and Offline Message forms.
In the Chat dataset, custom fields are available under Pre-chat Custom Field, Post-chat Custom Field, and Wrap-up Custom Field. In the Offline Message dataset, they are available under Offline Message Custom Field. Supported field types include Radio, Checkbox, Dropdown List, and Checkbox List.
To learn more about creating Custom Reports, see this article.