How to filter Metabox custom field of type checkbox

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Hello. I have created Custom Fields using Metabox. The custom field is of type ‘checkbox_list’. It seems that Filter Everything does find this custom field. I get the message ‘There are no filter terms yet’.
Custom field that I have created with MetaBox:

[
               'type'    => 'checkbox_list',
               'name'    => esc_html__( 'Gjuha', 'online-generator' ),
               'id'      => $prefix . 'gjuha',
               'options' => [
                   'Shqip'    => esc_html__( 'Shqip', 'online-generator' ),
                   'Anglisht' => esc_html__( 'Anglisht', 'online-generator' ),
                   'Italisht' => esc_html__( 'Italisht', 'online-generator' ),
               ],
               'std'     => 'Shqip',
           ],

Can you help me solve this problem?

thank you

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