Problem accessing outer AND inner indexes inside nested arrays at the same time

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Hi, I've got nested arrays such as this one:

"outer" : [
{
"inner": [
{},
{}
]
},
{
"inner": [
{},
{}
]
}
]

I neeed to generate an output like that one:

outer[0].inner[0]
outer[0].inner[1]
outer[1].inner[0]
outer[1].inner[1]

My problem is that once I'm inside the inner context, I do not know the outer index. $idx gives me the index of inner. Is there a way for me to access the outer index inside the inner context?

Template example:
{#outer}
{#inner}
outer[???].inner[{$idx}]
{/inner}
{/outer}

Start from the nested-array template example in the issue and determine whether Dust supports accessing the outer array index from the inner context. Verify the behavior against the expected four output paths; the work is done when the template can produce those paths or the supported limitation is documented.

Written by the indexing model from the issue text.