Highly unlikely. The current Roku players have audio bitstream passthrough, but only for DD and DTS. No lossy codec is supported. I think if they had added it they would have made it perfectly clear, because we've been asking for it for years. Right now the least costly method of streaming the lossless audio codecs from movies rips is the Nvidia Shield. Find a sale and you can probably get one for about $150. For a home theater it's far better than a Roku. And I say that as a Roku enthusiast. Roku just doesn't seem to want to cater to the more serious home theater user.
Nvidia Shield, Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.