In our store, we use a third-party app from the Shopify App Store called Multi-Label Barcodes (no affiliation – other barcode apps are available). I just checked and it supports Zebra 2.25 x 1.25 labels. Basically, it creates a PDF of your selected labels, so as long as you can print a PDF to your LP2824 on your Mac, then something like this would likely work and not be too expensive.
Do you have your LP2824 set up on your Mac already? If not, a Google search will take you to some helpful advice (including a YouTube video which looks like it walks you through the steps).