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Changing ttml fontsize from the SDK

We have a common ttml for both mobile and ott devices. The fontsize is being set as 16px which is optimal for mobile devices. But 16px is too small for Roku. Is there a way to override this from the App and increase the fontsize before displaying closed captions?


<style xml:id="defaultSpeaker" xmlns:_="" _:fontSize="16px" _:fontFamily="Arial" _:fontWeight="normal" _:fontStyle="normal" _:color="white" _:backgroundColor="black" _:textAlign="center" _:origin="10% 85%" _:extent="80% 10%"></style>
              <style xml:id="defaultCaption" xmlns:_="" _:fontSize="16px" _:fontFamily="Arial" _:fontWeight="normal" _:fontStyle="normal" _:color="white" _:backgroundColor="black" _:textAlign="center" _:origin="10% 85%" _:extent="80% 10%"></style>
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