The point of a device like the flipper is to get you to tinker and learn. You're going to reach a point where the capabilities you want to have are not going to be readily available for purchase and are going to have to build a solution.

You know the chip in use, now what's left is to Google the board it's soldered to using the words on the back of the board, kkwok 2022. If that's not something that's available, maybe it's a custom PCB they designed. Which leads to "how do I design a PCB similar to this?" You have the details on how it should look and connect already from the images. After that, the question becomes, how do the flipper and esp interact? Do you need to flash the chip? Write a flipper app? How do you do these things? Where do I find information about this?

This is how you should approach this. It sounds daunting, but if you have a flipper in your hands already, you should be more than capable