I use Media Utilities. It works with Spotify and Podcast (and possibly more).
The disadvantage is, that it needs notification access to read out the current track/podcast. Additionally the user interface is a little odd and buggy.
But it works and nothing bad has happened yet.
...yay, can't post links as a newbie, but I bet you can find it yourself in the Play store ( com.batescorp.notificationmediacontrols.alpha )