If “All” option, manually index all other choices

<?php

// Add to your (child) theme's functions.php and re-index afterwards

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'audience' == $params['facet_name'] ) {
        if ( 'for-all' == $params['facet_value'] ) {
            $new_row = $params;

            $new_row['facet_value'] = 'for-individual-employees';
            $new_row['facet_display_value'] = 'For Individual Employees';
            $class->insert( $new_row );

            $new_row['facet_value'] = 'for-jobseekers';
            $new_row['facet_display_value'] = 'For Jobseekers';
            $class->insert( $new_row );

            $new_row['facet_value'] = 'for-hr-professionals-team-leaders-anddi-practicion';
            $new_row['facet_display_value'] = 'HR Professionals, Team Leaders and D&I Practitioners';
            $class->insert( $new_row );
        }
    }
    return $params;
}, 10, 2 );