In first place welcome to this community :)
In the first place, you need to export your Trello cards to CSV for this propose you can use this chrome extension https://chrome.google.com/webstore/detail/export-for-trello/nhdelomnagopgaealggpgojkhcafhnin?hl=es
After that, you need to import these cards to Jira Cloud you can follow this guide: https://confluence.atlassian.com/adminjiracloud/importing-data-from-csv-776636762.html
I hope this help,
If you had to thrive a new habit during a lockdown, what would it be? Trello
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