Requester: crowd-entity-annotation example from guideline not working

Hello,

I am developing an interface in the requester sandbox (interface, not API). I need an interface that uses the crowd-entity-annotation element: https://docs.aws.amazon.com/sagemaker/latest/dg/sms-ui-template-crowd-entity-annotation.html.

However, when I copy the example in the "design layout" tab and try to publish it I get the error: Layout does not contain any fields for Workers to provide responses. Please include at least one field (input, select, or textarea).

It looks like this element online works inside <crowd-form> </crowd-form> but it is specifically written in the guidelines that this should not be used.

Does anyone know how I can make use of the crowd-entity-annotation element?