Hi Josué,
As a reference for readers, here the link to IBM Cloud Object Storage.
It has several SDKs

Java, Pyhton and Node.js you cannot use to integrate with OutSystems, the IBM Cloud Object Storage API is the only easy way to integrate. Read the how to connect to ibm cloud object storage page.
The REST API described on this page you can consume in OutSystems. To see how to do this read the OutSystems documentation on Consume REST APIs
Kind regards,
Daniel