When viewing an incident record in Platform UI where the Caller is VIP, there is a VIP icon displayed next to the Caller field. In Agent Workspace, there is no VIP icon displayed on the form.
Release or Environment
This is expected behaviour. As mentioned in the Configuring Agent Workspace lists product documentation under the "Configure field styles for Agent Workspace", it mentions
Field styles are only supported in the list view for Agent Workspace, not the form view. Only the background color field style is supported.
Create a "background color" field style for the Caller field.