Searching for legend source, Dragon vs Shisa

I've been searching for an Okinawan source about the dragon vs shisa legend – a dragon was attacking the shore, the king/emperor came to the rescue with a small shisa statue that roared so loud a boulder jumped up and fell on the dragon.

I've got some European sources on this, but can't find anything from Okinawa, can someone help please?

by Telephusbanannie