Ensure that `eventData` in the send event method doesn't have any nesting

Valid example for eventData

```
{
  "x": [1, 2, 3],
  "y": 555,
  "z": false
{
```

Invalid example
```
{
  "x": [1, 2, 3],
  "y": 555,
  "z": {     <--- We cannot have additional maps/objects as values
    "a": 5,
    "b": [1, 2]
  }
{
```