Append remarks value with overwrite file instead of replace

Hello,
Is it possible to append the existing `remarks` value with an overwrite file instead of replacing it?

The API class:
```csharp
///
/// My summary.
///
///
/// My remarks.
///
public class MyClass
{
}
```

The overwrite file:
```markdown
---
uid: MyClass
remarks: *content
---
My overwrite file content.
```

**Actual produced remarks in HTML:**
```html

My overwrite file content.

```
**Desired produced remarks in HTML:**
```html

My remarks. My overwrite file content.

```