Sure, see, e.g., How add data field to URL in HTTP Integration? But even V3 does not support that so don’t hold your breath. Aside: a lot will change in V3, so make sure your application is generic. Like: in the endpoint extract the data you need as early as possible, rather than passing the full JSON data to your actual application code.
(If you need a free a free for 3,333 messages per day third-party service to proxy/route your HTTP Integration payload then maybe a Pipedream example can help.)