a!toJson excluding null values.

I have CDT with following fields

• While using a!toJson , it is EXCLUDING fields which are having NULL values except fields with TEXT datatype.

Expresion: -  a!localVariables(
local!data: 'type!{urn:com:appian:types:RS}RS_dummyCDT'(id: 1, name: "abc"),
a!toJson(local!data)
)

Result:

Note: If I use parameter removeNullOrEmptyFields as true, it also excluding text fields which are null

a!localVariables(
local!data: 'type!{urn:com:appian:types:RS}RS_dummyCDT'(id: 1, name: "abc"),
a!toJson(
value: local!data,
removeNullOrEmptyFields: true
)
)

Result:

• While using a!toJson_17r1, it is returning all the fields of the CDT irrespective of NULL values.

Expression: a!localVariables(
local!data: 'type!{urn:com:appian:types:RS}RS_dummyCDT'(id: 1, name: "abc"),
a!toJson_17r1(local!data )
)

Result:

I want to get the data the way we are getting result while using a!toJson_17r1. i.e. I want to get all the fields of CDT irrespective of NULL value.

Is there any way to achieve this using a!toJson?