Your best bet will be to run this by our cloud team. It's a slightly different process then the discuss forum as you have to open a support ticket but that's perfectly fine for questions such as this. Log in to your cloud user console and click the help button. You can submit a ticket from there.
As far as I know you can not install custom Kibana plugins in Elastic Cloud. Kibana does however have a Logs UI which supports tailing of logs. Would this meet your needs?
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