Nested accordion not able to access @index of parent

I have a nested accordion here: https://imcw.azurewebsites.net/Programs/Mentoring/Find-a-Mentor

This template:

{{City}}, {{State}}

{{Biography}} Choose {{FirstName}}

I need to get the @index of the parent accordion to create unique identifiers for the children, but {{@../index}} always returns null. Do you have an example on nested #each loops that access the parent index?

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Nested accordion not able to access @index of parent

{{City}}, {{State}}

{{FirstName}} {{LastName}}

{{Status}}