How to update a nested value?

[AnxoBastos]

I don't know how to update a nested value with "wp option patch". I need to update the value of the key 'delete_rate' that is in this associative array that i have on options:
( I use wp-cli on PhP with exec() and popen() )

-Update: Now i do the patch update successfully but the changes doesn't apply to the database. When i get the options with wp-cli it appers changed but when i see the database not.

a:8:{s:8:"settings";a:1:{s:10:"percentage";b:0;}s:5:"roles";a:6:{s:12:"abdm_customer1";a:2:{s:9:"role_name";s:7:"customer1";s:9:"role_rate";s:12:"rate_tarifa5";}s:12:"abdm_customer2";a:2:{s:9:"role_name";s:7:"customer2";s:9:"role_rate";s:21:"rate_t._latinoamerica";}s:20:"abdm_customer3";a:2:{s:9:"role_name";s:15:"customer3";s:9:"role_rate";s:21:"rate_t._esp";}s:16:"abdm_customer4";a:2:{s:9:"role_name";s:11:"customer4";s:9:"role_rate";s:14:"rate_tarifa_21";}s:17:"abdm_profesional1";a:2:{s:9:"role_name";s:12:"Profesional1";s:9:"role_rate";s:14:"rate_tarifa_21";}s:9:"abdm_ruth";a:2:{s:9:"role_name";s:4:"ruth";s:9:"role_rate";s:21:"rate_t._latinoamerica";}}s:5:"rates";a:3:{s:12:"rate_tarifa5";a:1:{s:9:"rate_name";s:7:"Tarifa5";}s:21:"rate_t._latinoamerica";a:1:{s:9:"rate_name";s:16:"T. Latinoamerica";}s:21:"rate_t._esp";a:1:{s:9:"rate_name";s:16:"T. ESP";}}s:10:"surcharges";a:0:{}s:7:"notices";a:0:{}s:14:"customer_types";a:3:{i:0;s:8:"Customer";i:1;s:12:"Professional";i:2;s:27:"Professional with surcharge";}s:8:"progress";a:1:{s:11:"delete_rate";b:0;}s:12:"withholdings";a:0:{}}