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  • Your additions to the field names need to have brackets around them

      <input type="text" name="<?php echo esc_attr($field['name']) ?>[image]" id="image_url"
                           value="<?php echo esc_attr($field['value']['image']) ?>">
    echo '<input type="text" id="pin_json"  name="' . esc_attr($field['name']) . '[json]' . '"  value="' . esc_attr($field['value']['json']) . '"  /> ';

    I’m not sure what the results of not having them would be, more than likely your field name in the form looks something like FIELDNAMEimage which is a completely different name than you expect it to be.