The answer is no, they do not. NTSC captions are "encoded" into Line 21 data of the vertical blanking interval which TriCasters are not set to pick up on.
Further information regarding workarounds or solutions may be found online. Here are a few links which may provide additional information including a link to our User Forum site.
https://webcaptioner.com/blog/2018/03/using-web-captioner-with-newtek-tricaster/
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