How do you ask for feedback or send a follow up email after being rejected?

Recently I've been hearing it's common to ask for feedback after being rejected by a company. My friend also showed me a tiktok where someone got auto rejected but followed up with an email about how he would be a great fit then got an interview.

I'm trying to come up with an email template, but I'm a little lost as to how to go about it.

For any of you that do this, do you have any advice or tips?

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