How do I make the Mannequin model slim?

Title, I've got this command, but on MCstacker I can't seem to find the slim option T-T
/summon mannequin ~ ~ ~ {profile:{"properties":[{"name":"textures","value":"e3RleHR1cmVzOntTS0lOOnt1cmw6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNTUwZTc4NDY5YmVjZjcyNjNkYmMxM2Q3M2Y3NzVjZjAyNmM1ZDUxZjgyNjE4ZDA1NzA5MGFkODY1OGQxY2JlMyJ9fX0"}]}}