How can you set even more data on the chat?

Apparently, speaker:SetExtraData() is very limited and I cannot change other properties of the chat. I want to change the stroke color and transparency, how can I do this? (example below, white text with translucent purple border)
Screen Shot 2021-11-12 at 3.13.39 PM
Make sure to zoom in on the image if it is too small

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List of ExtraData types

This doesn’t include anything for setting strokes, is it even possible?

Edit: It’s not really a stroke, its a dim effect around the text

Im not completely sure, but I think to achieve this you must create your own chat.