You won't be able to do that with TurboTax to notify the IRS of a bank account change. If you want to do this for the anticipated government economic impact payments we are still waiting for IRS guidance regarding the ability of changing direct deposit bank account information.
You can stay updated by checking back on the following links:
I changed my address on my turbo tax account cause i moved and my address ain't the same as it is on my 2019 tax return neither is my direct deposit. How since i did that will my stimulus check go to the address i have on turbo tax or will or will it go to the one on my 2019 tax returb
If you were entitled to a stimulus payment and did not receive the payment itself or the full amount you were entitled to, then any additional stimulus you qualify to receive will be added as additional refund on your 2020 tax return. This is also true if the IRS cannot direct deposit to an account you have closed and cannot mail you the payment because you have moved.