Any way to filter subscriptions via tags?

We have a lot of subcriptions and I need to filter them via tag.

The only way I found it was to list all the subs (`az account list`) and then call `az tag list --resource-id /subscriptions/${subid} -o json`.
This is painfully slow as it takes about 30 seconds to execute on 88 subs.

I looked into `az resource list` but that always points to a single sub and can be used to filter resources inside the sub.

Any better way of doing this?

We are going to end up calling the `az tag list` api a lot!