[FEATURE]: Allow `Element` property of `MarkerOptions` to be serialized

[desmondinho]

Is your feature request related to a problem?

I want to set custom markers using ElementReference object.

<div @ref="@Options.Element">
    @ChildContent
</div>

And then just replaceChildren in JS.

Describe the solution you'd like

// MarkerOptions.cs

[JsonPropertyName( "element" )] // <---
[JsonIgnore( Condition = JsonIgnoreCondition.WhenWritingNull )] // <---
public ElementReference? Element { get; set; }

Describe alternatives you've considered

No response

MapLibre JS Reference

No response

Example Usage

Additional context

No response

Contribution

• I'm interested in implementing this feature with guidance