Hi, Rajashree!
Welcome to the Atlassian community!
While we can't provide specific guidance on integrating with the 3rd party power-up for assigning priority, you might consider using custom fields to assign priority instead. In that case, you can refer to this document on the Trello REST API for custom fields: https://developer.atlassian.com/cloud/trello/rest/api-group-customfields/.
Hopefully, this helps!
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