Well currently epic link is not searchable in the next-gen projects
https://jira.atlassian.com/browse/JSWCLOUD-17239
Next-gen does provide out of the box integration for github and bitbucket, I am not sure 'bout Gitlab hence I don't think it's supported out of the box.
For Gitlab you can refer this - https://docs.gitlab.com/ee/user/project/integrations/jira.html
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