There is an issue that tracks the request for the spotify like integration (
https://github.com/sll552/DiscordBee/issues/3), in short: this will most likely never be possible.
Line breaks are not possible as discord always correctly escapes them, this is kind of a security measure by them.
For disabling the track count, this is already possible. After looking at it this might actually be kind of a bug or at least an unexpected behavior.
The problem is that you cannot set one of the string fields in the settings to an empty string (e.g. the track field) if you do that it will be silently ignored (this behavior could be changed). You can however workaround this by setting the 2 track count fields to " " (space character) as this will be stripped and the track numbers won't be displayed in discord.