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If you are referring to the context of marketing cloud, you should be able to do it via Email Studio following the steps outlined in https://trailhead.salesforce.com/content/learn/modules/email-creation-and-sending/test-and-send-emails
From the core aspect, you can choose your email Template and click the button 'Send Test and Verify Merge Field' to see a preview.
See https://help.salesforce.com/articleView?id=000329523&type=1&mode=1 for more details.
If this information helps, please mark the answer as best. Thank you