Could you clarify your definition of footnote?
I looked up the verse and found this...
1 John 5:7 ►
Verse (Click for Chapter)
New International Version
For there are three that testify:
New Living Translation
So we have these three witnesses--
English Standard Version
For there are three that testify:
Berean Study Bible
For there are three that testify:
Berean Literal Bible
For there are three bearing testimony:
New American Standard Bible
For there are three that testify:
King James Bible
For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one
****
Commentary/ footnote...whatever folks want to call them:
Pulpit Commentary
Verse 7. - For those who bear witness are three, and thus constitute full legal testimony (Deuteronomy 17:6; Deuteronomy 19:15; Matthew 18:16; 2 Corinthians 13:1). It will be assumed here, without discussion, that the remainder of this verse and the first clause of verse 8 are spurious. Words which are not contained in a single Greek uncial manuscript, nor in a single Greek cursive earlier than the fourteenth century (the two which contain the passage being evidently translated from the Vulgate), nor are quoted by a single Greek Father during the whole of the Trinitarian controversy, nor are found in any authority until late in the fifth century, cannot be genuine.
Gill's Exposition of the Entire Bible
For there are three that bear record in heaven,.... That is, that Jesus is the Son of God. The genuineness of this text has been called in question by some, because it is wanting in the Syriac version, as it also is in the Arabic and Ethiopic versions; and because the old Latin interpreter has it not; and it is not to be found in many Greek manuscripts; nor cited by many of the ancient fathers, even by such who wrote against the Arians, when it might have been of great service to them: to all which it may be replied, that as to the Syriac version, which is the most ancient, and of the greatest consequence, it is but a version, and a defective one.
*******
So folks are questioning the Trinity?
The world gets stranger and stranger each day.