Modify OData API response after OData is executed

How do I modify the result data of an OData API?

For example, in the response of a list OData API, we want to set some property to null.

I tried to do it in IResultFilter.OnResultExecuted like this:

    public class MyResultFilter : Attribute, IResultFilter
    {
        public void OnResultExecuted(ResultExecutedContext context)
        {
            var result = context.Result as OkObjectResult;
            var data = result.Value as EntityQueryable<Microsoft.AspNetCore.OData.Query.Wrapper.SelectAllAndExpand<DbContext.Table1>>;

            //modify data
        }
    }

    [EnableQuery]
    [MyResultFilter]
    public IActionResult Get()
    {
        var querable = DbContext.Table1.AsQueryable<Table1>();
        return Ok(querable);
    }

But the SelectAllAndExpand is internal so the code won't compile.

Is there a better way to do this?