What I do for my labels is select the entire label and then export as a PNG.
Go to File>Export PNG Image...
This will open the export window.
Select your entire label and in the export window, select "Selection" at the top. Click the "Export As..." button and select where you want to save your image and what it'll be named. Then click save. Finally, back in the Export window click "Export"
Now your label will be saved as a PNG where you told inkscape to save it. The only downside is your image will be rasterized, so make sure you export at a large resolution so you don't have to sacrifice quality when resizing. Hope that helps!