Block Components Documentation - minecraft:map_color

Sets the color of the block when rendered to a map. If this component is omitted, the block will not show up on the map.

Map Color Properties

Name	Default Value	Type	Description	Example Values
color	not set	String	The color is represented as a hex value in the format "#RRGGBB". May also be expressed as an array of [R, G, B] from 0 to 255.
tint_method	not set	String	Optional, tint multiplied to the color. Tint method logic varies, but often refers to the "rain" and "temperature" of the biome the block is placed in to compute the tint. Supported tint methods are "none", "default_foliage", "birch_foliage", "evergreen_foliage", "dry_foliage", "grass" and "water" This item requires a format version of at least undefined.