Does Song of Songs 8:6 contain a reference to YHWH?

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It has been pointed out that Song of Songs is one of only two books¹ among the canonical Hebrew scriptures without direct reference to God. However, there is an enigmatic יָה- (-yah) at the end of 8:6 that has been variously translated:

ESV

Set me as a seal upon your heart,
as a seal upon your arm,
for love is strong as death,
jealousy is fierce as the grave.
Its flashes are flashes of fire,
the very flame of the Lord.

But NET

Set me like a cylinder seal over your heart,
like a signet on your arm.
For love is as strong as death,
passion is as unrelenting as Sheol.
Its flames burst forth,
it is a blazing flame.

The NET agrees with KJV, NASB, and NIV in considering -yah an intensive adjectival suffix, while ESV, CJB, and others interpret it as an abbreviated reference to YHWH.

How is –yah best understood here?

^{1. The other is Esther, with qualifications given at the link provided.}