Adding a meta tag to the <head>

I’m trying to add a meta tag to the app’s head. When I use the “Add Custom Code” feature like below, it is added underneath the data-spr-custom-code=“appHeader” and the bot is unable to read the tag.

[adding the meta tag to the custom code]

[results shown on the Dev Tool]
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Is there anyway to add a meta tag directly under the head?