You can use wp config set to update any existing value in wp-config or to add a new value:
wp config set DB_NAME some_db_name
wp config set DB_USER some_db_username
wp config set DB_PASSWORD you_secret_value_pass
See https://developer.wordpress.org/cli/commands/config/set/
Keep in mind that values are case sensitive, so if you do wp config set db_name some-db, it will add a NEW value rather than update the value for DB_NAME.
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