TPA6211A1: Gain formula for TPA6211A1

Hello,

I want to use Calculating Gain for Audio Amplifiers (Rev. A)  to calucalte gain for TPA6211A1 BTL amplifier. But in this guide the gain fromula is given 2*Rf/Ri

In the datasheet of TPA6211A1 gain is given like:

what formula shall be used to calcualte gain when using TPA6211A1 in SE input configuration?

Thank you!