double layer of a!forEach

If you need to nest an a!forEach() inside another a!forEach() and want to refer to the outer fv!item, you can either put it in a local variable before calling the second a!forEach() or put the inner call in a separate rule and pass in fv!item via a rule input. For example:

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a!forEach(
  items: {"January", "February", "March"},
  expression: a!localVariables(
    local!month: fv!item,
    a!forEach(
      items: {1, 15},
      expression: local!month & " " & fv!item
    )
  )
)

The above expression returns a three item list containing {"January 1", "January 15"}, {"February 1", "February 15"}, and {"March 1", "March 15"}