Set default country for phone number field in Stripe Connect onboarding?

This is pretty minor, but for better UX, during stripe connect onboarding, I would like the phone number field to default to the connected user's country (just like the address field does). How can I make this happen? Note that I do not have the user's phone number, so I can't provide it as a parameter to Account.create()

Reproducible example

Create an new account and onboarding link

country = "US"

Stripe.api_key = Rails.application.credentials[Rails.env.to_sym][:stripe][:secret_stripe_test_key] 

account = Stripe::Account.create({
  country: country, 
  type: 'express',
  capabilities: {
    card_payments: {
      'requested': true,
    },
    transfers: {
      'requested': true,
    },
  },
  settings: {
    payouts: {
      schedule: {
        interval: "manual"
      }
    }
  }
})

account_links = Stripe::AccountLink.create({
  account: account.id,
  refresh_url: 'https://example.com/reauth',
  return_url: 'https://example.com/return',
  type: 'account_onboarding',
})

When visiting the onboarding link (i.e. via account_links.url), despite the account's country being "US", the phone number defaults to Australia:

Question

How can I make the phone number field default to the country of the account?

Note

The address field does default to USA, as desired: