"Invalid subscript using both String name and range operator." why can't index array with both string and numeric?

[johnnnywang]

Hello:

    Here's just for a question when I use "array of containers" like "FileGlobals.MyContainers["Array0"]["Array0_0"]["Array0_0_0"]["Status"]"

I just can index the value "Status" by naming the property like above or with number

While can't do like this: "FileGlobals.MyContainers["Array0"]["Array0_0"][0..]["Status"]"?