We have got this new feature with Spring 20 release.
To construct a custom button or link that launches a new record with pre-populated field values, use this sample formula:
/lightning/o/Account/new?defaultFieldValues=
Name={!URLENCODE(Account.Name)},
OwnerId={!Account.OwnerId},
AccountNumber={!Account.AccountNumber},
NumberOfEmployees=35000,
CustomCheckbox__c={!IF(Account.SomeCheckbox__c, true, false)}
The URLENCODE function works only when creating custom buttons and links. It cannot be used for custom fields.