Add the "pimcore_ai_wysiwyg" editable to your areabrick template:
<div>
{{ pimcore_ai_wysiwyg("aiWysiwygEditableId", {areabrick: areaId}) }}
</div>
The areabrick option is used for the editable configuration (see at bottom).
The "pimcore_ai_wysiwyg" extends the default pimcore WYSIWYG editable. See official Pimcore Documentation
Create an entry for each editable:
pimcore_ai_tools:
editables:
m04_module_04:
- aiWysiwygEditableId
- aiWysiwygEditableId2
In this example the m04_module_04 is the id of the areabrick.