It is definitely possible to grant a user view only permission to a project in Jira. The way you set permissions is different between what we call classic and next-gen projects.
In a classic project a user should be granted the browse project and view read-only workflow permissions. In a next-gen project you would add that user to the viewer role.
Read more about project permissions in the documentation:
Hey there Cloud Community members! We’re excited to give you the first glimpse of the new home for business teams on Jira — Jira Work Management. Jira Work Management is the next generation of J...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events