You can do so by enhancing class CL_BS_BP_GUIBB_ROOT. Create a "post-exit" enhancement to method IF_FPM_GUIBB_FORM~GET_DATA in which you can control the values of the drop-down list. Table CT_FIELD_USAGE will have a row with NAME = 'GROUPING'. You need to update the FIXED_VALUES field in that row.
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