Hi Vineet,
Use the REST Action in Microflows to get the integration done.
https://docs.mendix.com/refguide/call-rest-action/
https://www.ibm.com/docs/en/filenet-p8-platform/5.2.1?topic=service-process-engine-rest-reference
https://www.redbooks.ibm.com/redbooks/pdfs/sg247743.pdf
Go Make IT