search/filter custom field value

I have to create a table that displays the data of the custom fields, I made a custom post type, the related custom fields and then i made the template using the plugin. I display the table perfectly just like i wanted using the “list of items” widget.

Now the only thing I miss is being able to search or filter the value of custom fields. The search bar in the widget works, but only for the title and not for the custom fields. among the settings of the block/widget there is a field “filter fields” but I can’t figure out how to use it and if it’s right for me.

I just need to find the custom fields value using the search bar already provided by the widget (I tried others but they modify my template with the standard WordPress archive one).

do you know how i can do this?