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The front door would have to output the needed information for the work you doing.  Then do a stack reference to the output in your working stack.

<https://www.pulumi.com/learn/building-with-pulumi/stack-references/|https://www.pulumi.com/learn/building-with-pulumi/stack-references/>

I know about stack references that's fine. But for example I can;t find an API to just add a new backend object to an existing Front Door instance

Just looked at ARM,  appears Microsoft didn't expose a separate API for backends.  It all nested within Front Door.

<https://docs.microsoft.com/en-us/azure/templates/microsoft.network/frontdoors?tabs=bicep|https://docs.microsoft.com/en-us/azure/templates/microsoft.network/frontdoors?tabs=bicep>

