How to create an optional repeating section with field validation

Hi,

I have a requirement to allow a repeating section to be optional but still contain validation rules if one or more rows is being added.

I've seen that you can't have 0 minimum rows for a repeating section so I'm trying to find another way to solve this.

The repeating section has two fields, one is a dropdown where the user selects a value and the other is a text field, if they are entering a value both the dropdown and text field need values in them. Putting a checkbox above the repeating section "Requires repeating section" and then using rules to hide the repeating section the validation still triggers when the repeating section is hidden.

I know the Validation Required property on the two fields supports the value Yes/No or Expression, is it possible to write an expression that checks the value of that checkbox indicating that the repeating section isn't required to mean the fields are no longer required? I haven't found an example of an expression anywhere in the documentation or these forums so I'm not sure what it should look like and nothing I've tried seems to work.