QGIS Python API set label color based on attribute field

I’m trying to set the text label color and size based on the attribute table. I got the size setting correctly but not the color.

My current result looks like this (The symbol has been set to be transparent), and I want to give different colors to different text labels.

The attribute table looks like this:

The code is as following:

vlayer = QgsProject.instance().mapLayersByName(layer_name)[0]
vlayer.renderer().symbol().setOpacity(0.0)

pc=QgsPropertyCollection('Text')
color_prop=QgsProperty()
color_prop.setField("color")

size_prop = QgsProperty()
size_prop.setField("size")
pc.setProperty(QgsPalLayerSettings.Color,color_prop)
pc.setProperty(QgsPalLayerSettings.Size,size_prop)

label_settings = QgsPalLayerSettings()
text_format = QgsTextFormat()

label_settings.setDataDefinedProperties(pc)

label_settings.fieldName = 'name'
label_settings.setFormat(text_format)

vlayer.setLabeling(QgsVectorLayerSimpleLabeling(label_settings))
vlayer.setLabelsEnabled(True)
vlayer.triggerRepaint()

I wonder where is wrong with the color setting in the code? My best guess is that the color field in the attribute table is not what QGIS requires, but I’m not sure what should be the correct format.

color_prop.setField("color")

color_prop.setExpressionString("replace(trim(color), ' ', ',')")