You will need to copy the contents of the data directory from EmulatorJS to the
data directory here.

In a web browser, go to the EmulatorJS GitHub page and download a copy of
EmulatorJS:
https://github.com/EmulatorJS/EmulatorJS

You can download EmulatorJS from the GitHub page by clicking the green "Code"
button and choosing "Download ZIP". Unzip that, and then copy the contents of
their data directory to your emulation/data directory in your web root.