Car icon on map card

I have a mqtt sensor which receives the gps location of my car. I am able to put that sensor in map card. However it shows initials of the sensor name instead of icon. Is there a way I can show a picture or icon in map instead of initials ?
I tried adding entity_picture attribute to the sensor, however config checker tells me that it is not valid. What else can I do to show the picture/icon on map ?

I did assign my car a PERSON account in ha, with no ability to login. and for it’s location I use a device tracker entity.
Maybe that helps you a bit…

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thanks ! that would be one way. I was hoping to have some built in way so I don’t pollute my person list.