Nothing can be done. The Tax Cuts and Jobs Act of 2017 eliminated that possibility. The taxable portion of the rollover to the Roth IRA must be included in your taxable income.
On the plus side, growth on the money in the Roth IRA will now be tax-free once the requirements for qualified Roth IRA distributions are met. If that money had been put into a traditional IRA, the growth would only be tax deferred. You might come out ahead in the long run.
