Hi JC,
I believe you are asking for a 'master bot' or 'bot of bot' style frameworks, where the ServiceNow virtual agent becomes the experience layer for Azure Bot Service brain in the back end.
We are formally building such a concept and feature into the product, currently planned ("safe harbor") for the Paris release.
Until then, something to consider is creating a virtual agent conversation 'talk to azure bot'. The conversations could have script blocks and recursive logic that takes the users input via a text input node, then sends it to the azurebot API, then prints the result via a html output. However, this can be dangerous for performance depending on the number of calls made, so i would advise waiting for the in-product solution.
