Download data from Google spreadsheet then convert to Json files. Please read GSheetJsonTutorial.pdf first to know how to set up this tool.
Don't be fooled by "Requires Unity 5.6.0 or higher". I'm too lazy to get an old version of Unity to upload asset.
This is a free asset, so it's great if it can help you, but if it can't or if there are some problems with this asset, please don't require any supports from me, I'm too lazy to do that.
Any suggests to make this asset better/fix bugs/improvement are appreciated. Thank you very much.