https://redd.it/ov4a7j

SetKeyDelay 75
SetTitleMatchMode 2

cols := []
indx := -1
last := ""
loop 4 ; 3=BZ, 4=CZ, 5=DZ...
{
    loop % 26
        l := Chr(64 + A_Index)
        , cols[last l] := indx++
    last := Chr(64 + A_Index)
}

#IfWinActive Google Sheets
    F12::
        KeyWait F12
        Clipboard := ""
        Send {Esc}^j
        Sleep 10
        Send ^c
        ClipWait
        Send {Esc}
        RegExMatch(Clipboard, "(?<COL>\D+)(?<ROW>\d+)", curr)
        Clipboard := ""
        vertical := currRow - 1
        horizontal := cols[currCol]
        Send % "{Left " horizontal "}^c"
        ClipWait
        txt := Clipboard
        Clipboard := ""
        Send % "{Right " horizontal "}{Up " vertical "}^c"
        ClipWait
        ; Send % "{Down" vertical "}" ; Optional
        Run % Clipboard
        Clipboard := txt
    return
#IfWinActive