Yes, you can import a CSV and have it update issues, but that is slow, clunky and requires a human to run the import. You should be looking at your process, not trying to do imports.
There are, procedurally, two types of testing you might do, manual (a human tests something and records the result) and automatic (a computer does the test)
If you are doing manual testing, your humans should be updating the issue in Jira, not introducing another error-prone step to slow everything down for no good reason by messing around with spreadsheets.
For automated tests, get the computer to do it - use an app that connects your test system to Jira so it can update it, or have the test system use the REST API to update Jira.
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