Web Apps - A 'repeater' field

Similar to WP ACF plugin - the ability to create a 'repeater' field, where it allows you to create a set of sub fields which can be repeated again and again whilst editing content.

An example of this is e.g. a Web App for "Projects", a repeater field would be great to have for Project images where using a 'repeater field' you can upload as many images as you want to that project