JACKSON

[dire heron]

This is not explicitly exposed, no. But you can find out the same way you can control it, for example by create a checkout session for the connected account with automatic_tax: {enabled: true }

If they don't have it enabled, you'll get an error back:
Stripe Tax has not been activated on your account

[remote siren]

gotcha thanks. Is using checkout session probably the easiest API call to use to verify?