Cassandra UDT not being persisted in cassandra database

Describe the bug

The code converts Json object in request payload to string for UDT. We debugged and found the issue with Cassandra.prototype.create function in loopback-connector-cassandra/lib/cassandra.js. Please provide the solution for the issue.

Logs

Payload object:
{
  id: 'c',
  name: 'otlsgy4',
  phone: '88774622572',
  address: {
    street: 'Sahastradhara Road',
    city: 'Dehradun',
    state_or_province: 'Uttarakhand',
    postal_code: '248001',
    country: 'India'
  }
}


Insert Query by loopback:
INSERT INTO "hotels"("id","name","phone","address") VALUES(?,?,?,?) [
  'c',
  'otlsgy4',
  '88774622572',
  '{"street":"Sahastradhara Road","city":"Dehradun","state_or_province":"Uttarakhand","postal_code":"248001","country":"India"}'
]

Expected Result: 
INSERT INTO "hotels"("id","name","phone","address") VALUES(?,?,?,?) [
  'c',
  'otlsgy4',
  '88774622572',
  {"street":"Sahastradhara Road","city":"Dehradun","state_or_province":"Uttarakhand","postal_code":"248001","country":"India"}
]

Additional information

No response

Reproduction

https://github.com/nishankpathak/cassandrademo

@dhmlau

Start in loopback-connector-cassandra/lib/cassandra.js at Cassandra.prototype.create and reproduce the issue using the linked cassandrademo example. Trace how the address UDT is bound in the INSERT parameters; done means the UDT is persisted as Cassandra structured data rather than a JSON string.