Yes. You can have (more or less) as many WiFi access points connected to your network as you want. You will want a WiFi access point OR a WiFi router that can be set to “bridge mode”.
There are some considerations for this kind of set up. Mainly, I would have the two WiFi networks have different SSID (names). If they are the same there can be issues of your devices trying to hold onto the signal from the WiFi access point that actually has a worse connection.
Edit. There are some solutions that can do a mesh WiFi network with nodes connected over Ethernet, but I am not sure how well that would work over power line.