Is there a way to pass name for Form and Field?

### Are you submitting a **bug report** or a **feature request**?
Probably a feature request

### What is the current behavior?
Field names are hardcoded, I would like to pass those to the Form.

### What is the expected behavior?

### Sandbox Link

### What's your environment?

### Other information

https://stackoverflow.com/questions/56402423/dynamic-name-for-react-final-form-field