I have a similar usage of sharing issues and specifally filter lists - to keep special user (and non users of your JIRA system) up to date. Maybe this free plugin would be a nice solution for your request?
You will be able to grant a 1:1 view of your filter list. This plugin create a unqiue link you can send to any person. Also you can control the share by delete the link or edit the displayed columns afterwards
Let me know if this is something for you.
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