Well, you can do this in the mail template I guess. Everything needed is in context. Breaking it into pieces,
1. Get the custom field
2. Get the field config
3. get options using the field config
Key and contextNode can be null.
4. Get Options from the Options object!
Judging by the default JIRA email features, I believe that this option is not available. However, you may try to extend the email funcitons using an external/third party plugin.
Please take a look to the JIRA Enterprise Mail Handler plugin > https://marketplace.atlassian.com/plugins/com.javahollic.jira.jemh-ui . Maybe it could be useful.
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