Create more than one body to a request

I was using the application, so i'd need to add a new body with different values and i was thinking: if we could have multiple bodys?

like: i choose what is the body i want to send.

for example, i have an endpoint to register an user, and i want to create two users.

so, i create a body and send the request, then i create another body and send other request.
in the next time i can choose which body i want to use to send this request.

i think this is a usefull feature