TAS2557: How does TAS2557 map the left channel and right channel data into one output?

Hello again, dear Audio Team,

the TAS2557 receives left channel and right channel audio data via the I2S ASI.
That data is generated by a stereo ADC TLV320ADC3101.
We intend to output L+R audio signals to one speaker in a mono way.
But i can't find the information, how the TAS2557 handles the L and R channel audio signals from the I2S input
during DAC processing and routing them to the class D amp.

Could it be, that the TAS2557 is already mixing those signals together to a mono output signal that drives the class D amp?

Could it be that there's nothing more to do?
If not, please point me to how to configure the TAS2557 to do it that way.

Kind regards

Andreas Paulin