This will add a new property to the Organization schema called "accountInformation"
This property will contain two properties:
"accountsCount", which is the count of Accounts associated with the Organization
"accounts", which is an array of Account objects, referencing the Account schema defined in account-rest-impl
An example of referencing another schema can be seen here: https://github.com/liferay/liferay-portal/blob/20f988768cf7476b19e63b30c52e2558861ea7e8/modules/apps/headless/headless-admin-content/headless-admin-content-impl/rest-openapi.yaml#L42-L47