[Viki] doesn't return episode number or any of the series output template

[ghost]

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~/Downloads/youtube-dl -o '%(episode_number)s.%(ext)s' 'https://www.viki.com/videos/1033597v-my-love-from-the-star-epilogue-episode-22' -v        [debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-o', u'%(episode_number)s.%(ext)s', u'https://www.viki.com/videos/1033597v-my-love-from-the-star-epilogue-episode-22', u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.09.01
[debug] Python version 2.7.13 (CPython) - Linux-4.9.0-3-amd64-x86_64-with-debian-9.1
[debug] exe versions: ffmpeg 3.2.7-1, ffprobe 3.2.7-1
[debug] Proxy map: {}
[viki] 1033597v: Downloading video JSON
[viki] 1033597v: Downloading video streams JSON
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://v4.viki.io/1033597v/1033597v_high_480p_1403051005.mp4?e=1535950501&h=ccaabefd815378cd29ddd877e2ce3cb7'
[download] Destination: NA.mp4
[download] 100% of 12.95MiB in 00:00

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As you can see instead of returning Episode number it returns NA

I did skim through the code once there was no mention on returning this or any of the filename commands mentioned in the homepage in the output template section

Available for the video that is an episode of some series or programme:

series (string): Title of the series or programme the video episode belongs to
season (string): Title of the season the video episode belongs to
season_number (numeric): Number of the season the video episode belongs to
season_id (string): Id of the season the video episode belongs to
episode (string): Title of the video episode
episode_number (numeric): Number of the video episode within a season
episode_id (string): Id of the video episode

Though i can read it and understand whats missing unfortunately i'm not good enough to write the code to add this!

[ghost]

I did find a solution for naming files in a playlist by using the autonumber function but again this cant be used for single video or if you're downloading a playlist from between

youtube-dl -o 'E%(autonumber)02d.%(ext)s' https://www.viki.com/tv/20503c-my-love-from-the-star