Update : I think I have found something, for those who were interseting.

*DMAT, mode, D, IMPORT, RST, file.rst, 11, 11
*EXPORT, mode, MMF, mode

This APDL command launched in the harmonic analysis (prior to the ANSYS SOLVE command) allows us to find the mode shape of the residual vector, in addition to the coordinate value of the response at each frequency in the mcf file. It was stored in the RST file after restarting the modal analysis for the RESVEC command (or any other option that requires a modal analysis restart).