Entity Name color doesn't work

If I summon an entity with custom colors (ex: /summon minecraft:pig ~ ~ ~ {CustomNameVisible:1b,CustomName:'

{"text":"ab","color":"red"}

'} or /summon minecraft:pig ~ ~ ~ {CustomNameVisible:1b,CustomName:'

{"text":"ab","color":"#FF0000"}

'} ) the colors doesn't work and the CustomName shows white