EXTVLCOPT has no effect for Android
Here is example:
#EXTM3U
#EXTINF:0,Россия_1_+0
#EXTVLCOPT:http-user-agent=Mozilla/5.0
http://zabava-htlive.cdn.ngenix.net/hls/CH_RUSSIA1/variant.m3u8
EXTVLCOPT in this playlist works on desktop vlc-3.0.6 but doesn't work on Android vlc-3.1.2