Yes, but just using a font you'll likely end up with an improperly encoded barcode. There's certain elements of the barcode that are likely to be missed (the beginning, middle, and end markers; the right half of the barcode being inverted, etc)... It's easier to just use a generator and then paste it in. That generator is especially nice, since it lets you specify the dimensions of the bars; that way you can generate the barcode much larger than you need it to be and then resize it down.