Hello Sir!
This is a funny task you want to complete.
Let me explain how I understand it:
You have a Wi-Fi module (ESP32 board) appearing as access point (running its own AdHoc network) and running a small "webserver" you can browse on your phone, laptop or PC.
You want now to display the results from a few devices, but on one webpage.
Is it correct?
It can be solved if one of devices will play the role of a master, and others will be the slaves.
The master will create the AdHoc Wi-Fi and run the "server", you can access from a browser.
At the same time other devices, the slaves can connect to the master via Wi-Fi, to the same server and send the information they have. Then the master will display everything in one page.
To achieve this, the server should be changes slightly (OK actually a lot of). to handle different types of requests.
The browsers send GET requests to ask the server send them the webpage, in case of other ESP32 devices you can use the POST request to send data. It will help to distinguish which device is connected.
My description is limited by number of characters I can send now.
Hope it was useful for you.
PS.
An another way also exist: the same master-slave scenario, but connect the slave devices to the master via Bluetooth bridge, running the master in so called co-existent mode (BLE and Wi-Fi).
This can provide more control options over the slaves, but using more code.
Really out of available characters.
Have a nice day!