doesn't display meta_key values starting with _underscore

there are some meta_value fields that i’d like to index if a certain meta_key value is found

but the meta_key value starts with an underscore:

_custom-item_item-data

how can i include meta_value values in searches if a meta_key value starts with an underscore?

If >

Table: wp_postmeta
Field: meta_key
Value: _custom-item_item-data

Then >

search meta_value

thanks ??

https://www.ads-software.com/plugins/wp-custom-fields-search/