Router config for Wi-Fi extender / repeater / bridge

I have setup a Wi-Fi bridge with relayd following this documentation.

I can access the router (TP-Link WR841ND) from my LAN (via Wi-Fi) using the router's IP
This access works on WebUI and SSH.
So I think the configuration is good.

My question regarding to this config is:
Can I use the same router as Wi-Fi repeater, means any mobile device connecting to Wi-Fi can be served by the router connected to ISP and in addition by this router?

If yes, what configuration must be added?