Please Help - Starbucks Brown Sugar Recipe Needed

I AM DESPERATE. I have been addicted to a specific Matcha recipe from Starbucks for a couple years now. I don't know why but it's this specific syrup combination that I can't find or be satisfied with from any other source. The Starbucks brown sugar syrup has been for sale on many websites over the years including amazon but always features an insanely high price tag. I've tried over the years to make my own brown sugar syrup recipe or find ones from other brands in order to recreate this syrup taste and have been unsuccessful. I've tried brown sugar syrup from torani, monin, 1883, and more, all are dissatisfying.

This is my Starbucks order:

Venti Iced Matcha Latte, made with oatmilk, 3 pumps brown sugar syrup, 2 pumps classic, cinnamon powder and light ice

Please! If anyone is able to/ or has replicated the syrup's taste, I'm desperate to stop giving Starbucks my money. Thank you.