Jira Cloud: How to make a custom field mandatory based on value of another custom field

[Aditiya Panday]

I have a cascading field which has two options (let's say Option A and Option B). For Option A, I have two other sub-options (Opt1 and Opt2) but for the Option B I have only one sub-option (Opt2).

I need to make the custom field called "EndDate" mandatory if Option B is selected.

Since there are no Behaviours in Jira Cloud, I am not really finding any solution for this. ;(

Do you have any suggestions?

[Fernando Eugênio da Silva]

@Aditiya Panday 

Naturally, this is not possible.

I believe it is possible using the Jira Misc Workflow Extensions app and applying a field required validator (JMWE) or using the built-in your script validator.

You can use the JMWE trial period to test this solution.