Hi,
It is possible to calculate exciton-phonon coupling using EPW in combination with BerkeleyGW. See the lecture by Dr. Dai here https://drive.google.com/file/d/1mXatJhFLgKZEUSGKhX0TGDU4N5JZveCC/view.
Within the EPW repo you can find an example for calculating exciton-phonon coupling and exciton-polaron formation energies. The link is here: https://gitlab.com/epw/q-e/-/tree/develop/EPW/examples/lif_hdf5?ref_type=heads.
However, the phonon assisted exciton absorption is still not implemented in EPW and may become available in a future version of the code.
Best regards,
Sabya.