Only SRT subtitles use the style that I set

Why is it that SRT is the only subtitle format that follow the style that I have defined? For example, I have set the subtitles to be a certain color, certain size, and under the video. SRT follows these settings and displays how I want it to. But other subtitle formats such as SUB/IDX or SSA don't follow my settings? It seems like SUB/IDX already has their own defined style and it overrides the style I have set in Kodi. Is there a way to change this?

Thanks.