vRO and ABX are fully capable of doing any API calls. So you can simply do API calls from vRO/ABX to LCM.
The LCM API is well documented and there are also examples on the internet on how to get information from the Locker.
To access the API, you must first authenticate and then use an API call.
POST [lcmhost]/lcm/authzn/api/login
GET [lcmhost]/lcm/locker/api/v2/passwords
(this will list all passwords in the locker, where you should get the vmid from the password that you want)
POST [lcmhost]/lcm/locker/api/v2/passwords/{vmid}/decrypted
(where {vmid} is from the previous step)
GET [lcmhost]/lcm/request/api/v2/requests{requestId}
(where {requestId} is from the previous step)
You can access [lcmhost]/api/swagger-ui.html for more details on the headers and body.