Stream MP4 download links

I have a use case where I’d like to access additional resolutions for the MP4 downloads. Making an API request to<ACCOUNT_ID>/stream/<VIDEO_ID>/downloads returns a payload containing a single URL for<VIDEO_ID>/downloads/default.mp4 which is a 1080p video - is there any way to get the 720p, 540p etc transcoded videos?

My understanding is that only the highest resolution is available as a .mp4 file. Other resolutions are accessible over .m3u8 though.