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The "base url" of an Atlassian system is the url that it is running on. Where you see quicksight say "https://xxx.atlassian.net", that's the base url for an Atlassian site called "xxx".
For a Jira cloud system, the base url will be suffixed with Jira, so "https://xxx.atlassian.net/jira" is what you need - replace the xxx with your site name.
I'm trying to create a dataset in Quicksight using JIRA as data source.Can you tell me what will be my site name here?
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