Arduino code. Create a Captive portal

For my final project, the idea it's that I'll have an ESP32 that's going to serve a webpage (where cool things are going to happen). But in all the examples I've found you need the IP address to access the webserver of my microchip. I'd like to imitate the webpages that you're redirected to in some wifi networks (usually to accept some conditions or login to have access to the web).

After looking for the library of esp8266 (for the NodeMCU) I don't find anything. And the only thing I found it's the name of "captive portal" that I didn't know it existed. (and this link of a complex sketch https://create.arduino.cc/projecthub/voske65/captive-portal-for-wifi-ap-a14155)

Has anybody worked with that?