Make Additional Highlight Fields with static content

I have an use case where the content_description should be static / need to enable highlight on content field.

when I try to add query.additional.highlighted.fields=content, getting error “content” is already available in response.

Could you please help with the options.

I’m not sure about your question… content field is highlighted one.

content field is not getting highlighted

I understood your request.
content_description is a highlighted field from the search engine, and the highlighted value is a partial text of the content. So, we cannot get highlighted content field.