Canning home made herbal tea?

Hello everyone! My husband and I have recently discovered we LOVE lemon balm lemonade. I make it by make lemon balm tea with lemon balm leaves from my garden. I then add a little sugar and a little lemon juice and thats all there is to it! If I omit the sugar, would it be safe to can this? Do I need to test the acidity of it first? I have a pressure canner and a waterbath canner, im just unsure if you can can herbal teas like this.