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I agreed with @Mikael Sandberg statement, currently is not possible out of the box. I believe you can take a look at this third party add-on that may provide you with the functionality - https://marketplace.atlassian.com/apps/1218481/refined-for-jira-cloud?tab=overview&hosting=cloud
Currently there is an outstanding existing enhancement request at Atlassian hand, I would recommend you to add yourself as a watcher of the issue - https://jira.atlassian.com/browse/JSDCLOUD-195
Hope this helps.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Technology Applications Team
The short answer is no, you cannot restrict the request types on the portal via groups.