List the values of a field with complaint counts, to find exact product/issue/response names. field is one of: product, sub_product, issue, sub_issue, company_response, company_public_response, submitted_via, state, timely_response. Optional search narrows by substring; product narrows issues to that product. Filters: company (exact name as in find_company), company_contains (substring), product, sub_product, issue, product: CFPB renamed credit reporting twice, so it appears under three product names (use list_values field=product), company_response (exact CFPB value, case-insensitive), submitted_via, state (2 letters), tag (e.g. 'Servicemember', 'Older American'), timely (true/false), date_from/date_to (YYYY-MM-DD or YYYY-MM, on date received).