No. eARC is specifically designed to take a signal only from an ARC port of a TV. A player like your Oppo will not work.
SACD over HDMI
I used an Oppo 105 and output DSD from SACD over HDMI into my Bryston DAC3, which has 4 HDMI inputs. Yesterday a power outage may have fried the Bryston. The current Bryston DACs removed HDMI.
My question is I ought to be able to replace it with any DAC that offers eARC with an HDMI input, correct? I’ve been doing this for 7 years now and have around 150 SACDs