Continual Service Improvement (CSI) is a stage in the Lifecycle of an IT Service and the title of one of the Core ITIL publications. Continual Service Improvement is responsible for managing improvements to IT Service Management Processes and IT Services. The Performance of the IT Service Provider is continually measured and improvements are made to Processes, IT Services and IT Infrastructure in order to increase Efficiency, Effectiveness, and Cost Effectiveness. See also Plan–Do–Check–Act.

Use case: We do a regular service audit to check if we meet service levels (SLA) and operational levels (OLA) and there are some action items that we are doing. However, we are managing those Service Improvement Plans (SIP) on a spreadsheet that's getting difficult to track.

Is there a plan to add such module within SDP?

I have just seen that ServiceNow already have such module:  https://docs.servicenow.com/bundle/london-it-service-management/page/product/continual-improvement-management/concept/get-started-cim.html