Field	Type	Description
title	string	Chart title (optional)
labels	array	X-axis labels
datasets	array	One or more data series
datasets[].label	string	Series name
datasets[].data	array	Numeric values
datasets[].color	string	CSS color (optional, auto-assigned if omitted)
axes.x	string	X-axis label (optional)
axes.y	string	Y-axis label (optional)
height	number	Chart height in pixels (default: 350)