Are nested repeaters possible?

Hello,

I was wondering if it was possible and if not what would be involved with having a nested repeater fields.

Ideally, I’d like somethign like the below as an outcome:

<repeater>
Text Input (Activity)
<repeater>
Text Input (Day)
Text Input (Time)
</repeater>
</repeater>

That way within an activity there could be a variable amount of day/times.

Thanks for taking the time to having a look and responding.

Cheers,