In addition to what @Alex Koxaras _Relational_ and @Charly [DEISER] said, you can also try our Feature Bundle. It's a free app for up to 10 users.
You could also use Automation to add a public comment with the current assignee in the comment body.
Out of the box unfortunately you can't do this. Even if you place the assignee as a field for the client to fill, this field will be hidden. A 3rd party app could possibly do this job for you. Here is an issue for you to vote and watch https://jira.atlassian.com/browse/JSDCLOUD-328 (currently under review)
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For this we have used an app called "Extension for Jira Service Management" in the marketplace (Display Additional Details - Extension for Jira Service Management (deviniti.com)), this app will allow you to share more info with your customers and extend the portal functionality.
Hope this helps!
Regards
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