➜ loops contact-properties create --name iceCreamFlavor --type string
Created.

➜ loops contact-properties list
KEY                   LABEL                 TYPE
__domain              __domain              string
age                   Age                   number
contactprop1          Contactprop1          string
contactprop2          Contactprop2          string
iceCreamFlavor        Ice Cream Flavor      string
firstName             First Name            string
lastName              Last Name             string
email                 Email                 string
source                Source                string
userGroup             User Group            string
subscribed            Subscribed            boolean
createdAt             Created At            date
__critical_audience   __critical_audience   boolean
notes                 Notes                 string
__marketing_audience  __marketing_audience  boolean
userId                User Id               string

➜ loops contact-properties list --custom
KEY             LABEL             TYPE
age             Age               number
contactprop1    Contactprop1      string
contactprop2    Contactprop2      string
iceCreamFlavor  Ice Cream Flavor  string