Workflow - Custom email - chat field

Hi,
In my custom email triggered by a workflow I use field chat. When I insert the field just as it is ${doo.model[“chat”]?.value ?? ‘’} text from the chat is shown as [object Object] in the email.

I also tried ${doo.model[“chat”]?.value.href ?? ‘’} or ${doo.model[“chat”]?.value.html ?? ‘’} and this returned blank.

Can chat field be used in the custom email? What is the correct syntax?