SalesIQ/Zobot - Cards in action/replies of operator_busy, pending, etc?

I'm looking at https://www.zoho.com/salesiq/help/developer-section/responses-actions.html and have the following question:

==> For actions like operator_busy, block, pending, and end do the replies HAVE to be only a List containing text messages, or can they contain other cards, like, articles, videos, etc ?

For example, is the following a valid action?

{
"action": "pending",
"replies": [
"Sorry to keep you waiting, but generating the detailed report is taking longer than expected".,
"In the meantime, here's a quick dashboard that the system auto-generated at midnight last night.",
{
"type": "links",
"text": "Dashboard as of 11 Jan 2020, EOD",
"links": [
{
"url": "https://somedomain.com/somepath",
"text": "Dashboard as of 11 Jan 2020, EOD",
"icon": "https://somedomain.com/icon"
}
]
}
]
}

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