We could not able to see SLA in customer portal even after configuring it in Extension for JIRA Service desk addon
There is no built-in support for showing SLA in portal. It seems you're using a feature from 3rd party plugin Extensions for JIRA Service Desk. I would suggest to go through the plugin's support (ie: add the tag addon-com.intenso.jira.plugins.jsd-extender to your question)
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