Restricting the entry of a text data type answer as a comma-separated integer on KoboToolbox

I work on KoboTool box and I have a question that needs its answers strictly entered as comma-separated integers. Is there any way of restricting the entry of a text data type answer as a comma-separated integer on KoboToolbox?

Eq:
Q. List all house numbers that have completed a certain task.
A. 43, 54, 78, 908, 1605

The answer needs to restricted to such a format. Is there any way of achieving this on KoboToolbox? Would we work on a Validation criteria here?