Is JIRA Portfolio a free add on or do we need to pay for it?
You can 'Try for Free" https://www.atlassian.com/software/jira/portfolio
But need to get a quote from Atlassian for your instance as it is dependent on the user tier.
See https://marketplace.atlassian.com/plugins/com.radiantminds.roadmaps-jira/cloud/pricing for the pricing
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