Podcasts are audio/video files served via RSS, a podcast app needs to know how read RSS and how to play or open your player, what you propose is something diffe

Podcasts are audio/video files served via RSS, a podcast app needs to know how read RSS and how to play or open your player, what you propose is something different, you would have to embed those ads somehow and extra functionality but keep backwards compatibility, if you mark the ads then you make it easy to add a function to skip the ads, then the publishers will want to lock the format with DRM so you can't skip those ads, IMO your idea will ruin the experience