JSF Filter posts that do not have any of the checked values

jsf-inverse-meta-filter.php

<?php 

class JSF_Inverse_Meta_Filter {
	
	public function __construct() {
		add_filter( 'jet-smart-filters/query/final-query', array( $this, 'change_query' ) );
	}
	
	public function change_query( $query ) {
		
		if ( empty( $query['meta_query'] ) ) {
			return $query;
		}

		foreach ( $query['meta_query'] as $index => $query_item ) {
			$query['meta_query'][$index] = $this->make_inverse( $query_item );
		}
		
		return $query;
	}
	
	public function make_inverse_single( $query_item ) {
		
		if ( ! isset( $query_item['key'] ) || ! isset( $query_item['compare'] ) ) {
			return $query_item;
		}
		
		$query_item['key'] = str_replace( '___inverse', '', $query_item['key'] );
		
		switch ( $query_item['compare'] ) {
			case '=':
				$query_item['compare'] = '!=';
				break;
			case 'REGEXP':
				$query_item['compare'] = 'NOT REGEXP';
				break;
		}
		
		return $query_item;
		
	}
	
	public function make_inverse( $query_item ) {
		
		if ( isset( $query_item['key'] ) && str_contains( $query_item['key'], '___inverse' ) ) {
			$query_item = $this->make_inverse_single( $query_item );
		} elseif ( isset( $query_item['relation'] ) ) {
			$query_item['relation'] = 'AND';
			foreach ( $query_item as $index => $inner_item ) {
				$query_item[$index] = $this->make_inverse_single( $inner_item );
			}
		}
		
		return $query_item;
		
	}
	
}

new JSF_Inverse_Meta_Filter();