You can keep the form button where you have it in the item details. Use the form button to submit the item, the seller email, the buyer email, and a Unique Identifer to a new chat sheet. In the item details sheet, create a relation column that links the item to the chat sheet using the item name or code. On the item detail page, create an inline list that uses the relation column to point to the chat sheet. Filter the inline list by signed in user. Only the the buyer and seller will see their own record in the list. Open the chat record in the inline list and add a comments component. Set the comments component to use the unique identifier value, so the chat will not be visible to other users. That should be it.
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