XenForo How to fill a breadcrumb variable into page title in threads

[CTS]

(I have another thread here but please ignore it. Poorly crafted thread and a mess of ideas. Focused here now)

Goal: To extract and use second level breadcrumb text to append to the beginning of the page title of a thread, located in the PAGE_CONTAINER template.

PAGE_CONTAINER template:
From:
Code:

<title><xf:title formatter="%s | %s" fallback="{$xf.options.boardTitle}" page="{$pageNumber}" /></title>

To:
Code:

<title><xf:include template="addtometatitle" /><xf:title formatter="%s |...

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