Yes, you can do it.
Tracking Okta licenses within Software Asset Management in ServiceNow depend on the integrations and connectors available between ServiceNow and Okta at the time of your use.
While ServiceNow has a Service Graph Connector for Okta to facilitate integration, the specifics of license tracking may vary.
You can consider type of Configuration, Customization.
Check the official documentation for both ServiceNow and Okta for any updates or guides related to license tracking and integration.

Try using following Endpoint for GET method :

"https://your-okta-domain/api/v1/licenses"

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best regards

Ashish