Showing degree symbol in roTextWidget

I have written a custom brightscript that displays the current temperature (pulling JSON from an API). All works perfectly but I have run into a problem with the degree symbol character. I was expecting to use something like: chr(176) + "C" but that doesn't work. I'm guessing this is to do with the encoding not being UTF-8? I've checked that the typeface I'm using includes the symbol. Any ideas?

Thanks in advance, 



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