Is there a recommended way to write custom js to make a field say pathbrowser inside a multifield as a requied field based on a condition?

@arunpatidar Is there a way to apply required property based on condition ?, say its optional at first and based on the checkbox on the dialog , the fields are made required and that field is inside a multifield. Similar to the min-max that applies to the whole multifield, whereas, here it is one of the field inside the multi-field.