Hi Prasanna,
Yes.. It should be possible. I think you can take a look at wget or curl?
https://confluence.atlassian.com/display/JIRACOM/Automating+JIRA+operations+via+wget
https://stackoverflow.com/questions/44173930/wget-to-download-excel-from-jira-automatically
You check also a Excel Connetor for JIRA plugin that allows to synchronize JIRA tickets with Excel export. Looking at this I think you can download Excel from JIRA only one time and later just open this file and synchronize it with JIRA.
Maybe this can be useful.
Best Regards,
Mirek
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