Apologies @sudharsan thiru, we do not support the EXT-X-SESSION-KEY at this time.
In the meantime, you can look into implementing a custom workflow where you can create your own playlists using a custom Apple HLS stream target.
You can alternatively create the playlist.m3u8 file only using third-party tools, and have it reference the chunklist URI in the playlist generated by Wowza.
Players would initially request this high-level manifest file with the EXT-X-SESSION-KEY tag, and then request the chunklist.m3u8 URI found in the high-level manifest.
The request for this feature has been submitted to the Engine team.