I wrote a very simple open source Android app to gather walkout songs from YouTube called 'Simple Song Collector'
You can download it from here:
https://github.com/UpAllNite-Software/simple-song-collector/releases/download/1.0.14/ssc-1.0.14.apk(may need to long tap and select download link on newer Android devices)
You may need to change your Android settings when prompted to allow sideload installation from your browser and override safety warnings, but there are no ads, tracking, or malware included so it is safe to do so.
Just enter title and artist in the search, pick the best match, tap the download button and it will add the song to your android files and Walkout Songs DJ will be able to see and use them in the 'My Music' selector. If you need to browse for the song files, they will be in the "Downloads/SimpleSongFinder" folder of your Android file manager. The Simple Song Finder also provides a choice of music or video search from the three dot button in the upper right. Some songs seem to only be available in the video category.