How to make comment field in Personio mandatory

Hello everyone,

I was wondering how did you solve the the problem with making a certain filed mandatory?

Precisely, we have created an absence type called Emergency day and when an employee requests this type of absence there is a field called Comment which is optional; is there any way to make the field Comment mandatory?

I know that at the moment that is not possible in Personio, but I was hoping maybe to get some ideas how did you encourage your employees to fill out this field or this type of field?

Thank you in advance.