Unfortunately, that is not an option. Direct deposit is only available for bank accounts.
The federal government does offer its own Roth IRA, and you can have your tax refund deposited into that account. Please follow this link for more information. https://myra.gov/how-it-works/?utm_expid=112154954-8.Qeme6cUVRgqW2nMIKAUdmw.0&utm_referrer=https%3A%...
Presumably, you could have your refund deposited into this government account and later roll the account over into your existing Roth IRA.