Hey mate, just create hotspot on your smartphone and fill those fields in code:
const char* ssid = "Hotspot SSID"; //set to ssid to same as in phone
const char* password = "Hotspot Password"; //set password to also same as on phone
I have thought, the Esp32 works as a wifi router hotspot, but it doesn't it needs to connect to router or smartphone hotspot.
Example Debug:
Connected to Samsung
22:01:20.705 -> IP address: 192.168.43.69
22:01:20.705 -> MDNS responder started
22:01:20.705 -> HTTP server started