I can see no purpose served. Besides this is more of an AV question. Netflix IS NOT HiFi.
Use your optical out of your TV to a DAC optical in. If you don't have one you can buy a cheap one for 100 bucks or cheaper. The DAC stereo outs connect to your Anthem. This will give you Netflix audio through your speakers(.2 channel)
I do it and it sounds great. Of course one of these forum trolls will probably disagree with me...but try it. I think you'll like it.
Since your smart TV only has optical audio output, that's what you'll have to use if you want to use your smart TV app for streaming video. Unfortunately this does mean you will be limited to the audio codecs that will go out over optical, which is probably 5.1 discrete LPCM, or Dolby Digital and Dolby Digital Plus. If that is what gets delivered to your TV by the streaming services. Dolby Atmos will not go out over the optical connection.
If you want Dolby Atmos, you will need to get a separate streaming box and use that instead of your TV's built in apps.
You simply need to get Netflix from another source with HDMI out. Since long ago, I have had a PC in my home theater, and used it to Stream anything. Now Smart TV's have it sitting idle. They are small, quiet fanless, HDMI out. I use a small chicklet sized wireless control with keyboard and trackpad, mouse buttons .. My Sony Blu-Ray Player is a Smart one, it can stream Netflix .... via HDMI to/thru your AV receiver.
With eARC you should be able to send the audio portion of your streaming content from your TV to your AVR via HDMI cable. I'm not sure why you would want to send the video?
Click on the “audio and subtitles” menu at the top of the screen. In this menu, click on audio, and change from stereo to surround sound 5.1. Another option, if your AV receiver has the setting, is to switch it to surround sound. On most devices, this should automatically modify the setting within the Netflix app krunker