Why is there no article before "key" in "key amongst them being ..."?

Question

Why is there no article before key in the sentence?

There are however pressing challenges for both systems, key amongst them being the need for better IT skills on the part of students and teachers.

Source: https://www.google.com/url?sa=t&sou...FjAKegQIBBAB&usg=AOvVaw1vanGVOuCeK6Iqllk7jLpz

Louis · Answer

Key here is an adjective not a noun, meaning important or crucial in achieving something.
Example: "When it comes to learning a new language, practice is key"

Why is there no article before "key" in "key amongst them being ..."?

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