To record "bookmarks" for interesting sections of podcast episodes (that I want to revisit some time later), I use my own (Android-only) app called "Stop It!" [0]. The mechanism that creates a bookmark is to pause and immediately unpause the playback (works with any headset). For each bookmark, the app records the audio player's Android package name, the artist / album / track name, the time code (in seconds) and other meta-data (if available). For selected audio players, the user can resume playback for bookmarks at a later time.

I have not worked on the app for a while, because it (still) works on my (old) Sony Android phone.

[0] https://github.com/MShekow/stop-it