Hello @Oshadhi Vindhyani
If you want to assign a user to a Project Role you will need to make them a licensed user.
Jira Software, as a product, does not have the concept of a "free guest" user. The application is made available to paid licensed user, and you can enable Anonymous access. If you enable Anonymous access the projects/permissions that you grant to "Public" will grant that access to everybody on the internet.
Jira Service Management has the concept of a "customer" user who has access only to individual issues through a "customer portal", and you are not charged for customer accounts. Anybody who needs access to the underlying functionality of Jira, though, needs a licensed account or the information has to be made accessible for anonymous access.
Alternately you could look for a third party app that might enable you to share information with users without granting them direct access to Jira.
Here is another post from 2021 that discusses this same topic.
https://community.atlassian.com/t5/Jira-Software-questions/Read-only-access-to-Jira-Projects-Issues-without-a-licensed-user/qaq-p/1875810
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