Can you use your iPhone as a hotspot but through the Wi-Fi network and not its own data volume?

So on laptop that is so that you can use the quasi repeater and strengthen the wireless network, now the question is whether you can do the same with the iPhone that we put it in the middle to get more Wi-Fi coverage in the back room, but not via the mobile hotspot network but to expand the wireless network

No, that will not work. The iPhone can only share its own mobile network via Wi-Fi.

No, that will not work. For that you can simply log in the other device in the WLAN

No, that is not possible!
It works better too:

Use a real wireless repeater and try no cucumber solution with devices that are not intended and cost 10 times.

https://www.saturn.de/...00476.html

PS:

A similar question:

Can I buy an iPad Pro for just under 1000 euro and use it as a cutting board in the kitchen, and is the iPad Pro suitable for dishwashers?

Just switch it off!