Will the sdk from atlassian allows to develop a standalone application / chrome plugin / some other app to fill timesheet in JIRA (Cloud Hosted at https://xyz.atlassian.net).
If yes, please share the links / tutorials. I'm unaware of atlassian sdk.
I'm expecting the flow as below
Ok, start with the basics - https://developer.atlassian.com/static/connect/docs/latest/guides/getting-started.html will guide you through creating a basic "Connect" application (Cloud only supports Connect add-ons, so where ever you read stuff about developing for JIRA, check that you're reading Connect development docs)
(Personally, I'd just use JIRA to do the timesheet entry as I'd log in as me, find my task and enter my hours, but that's just me wondering why you think you need another application to do it.)
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