I already did a post about Ethernet with ENC28J60 in Mbed Core.
Now I adopted the ESPHost library for the Mbed Core, especially for the Nano RP2040, which has esp32 on board. The ESPHost library is originally from the Renesas Core for Portenta C33.
It is still work in progress and I guess there will be progress only if there is interest from the community. For what I need it works, but that is just basic tests of the Mbed Core WiFi library.
The ESPHost-EMAC library is here: https://github.com/JAndrassy/ESPHost-EMAC
Firmware and upload instructions are here https://github.com/JAndrassy/ESPHost/tree/main/extras/firmware/NanoRP2040
coming soon: Pico Core WiFi library support with ESPHost library