email = test@test.com

[{
"field":{"field":"email"},
"op":"=",
"value":{"value":"test@test.com"}
}]```

id IN (1, 2)
```json
[{
"field":{"field":"id"},
"op":"IN",
"value":{"list":[{"value":1},{"value":2}]}
}]

email IS NULL OR email=''

[{
  "field":{"field":"email"},
  "op":"=",
  "value":{"value":""}
},
"OR",
{
  "field":{"field":"email"},
  "op":"IS",
  "value":"NULL"
}]