Configure returnUrl on the form object

[mtwalsh]

In Freeform v4 we were able to configure the returnUrl like this:

{{ craft.freeform.form(formHandle, {
    returnUrl: uri ~ '?success=1',
    formAttributes: { "data-form-id": formHandle }
}).render() }}

In v5 I can see forms automatically have data-handle={{ formHandle }} but I can't see a way to set the returnUrl at the template level?