asp.net core get additional info with json and jquery

Question

I have a select built on json and jquery but the data is concatenated

 

json

public async Task<JsonResult> OnGetAssetAsync(string id)
        {

            var assets = await _context.WOAssetAssets.Where(s => s.WOALId == id)
                                      .Select(s => new SelectListItem
                                      {
                                          Value = s.WOAId.ToString(),
                                          Text = s.AssetID + " " + "/" + " " + s.AssetName
                                      }).ToListAsync();

            return new JsonResult(assets);
        }

jquery

$(function () {
    $("#Asset").on("change", function () {
        var categoryId = $(this).val();
        $("#Equipment").empty();
        $("#Equipment").append("<option value=''>--Select Equipment--</option>");
        $.getJSON(`?handler=Equipment&id=${categoryId}`, (data) => {
            $.each(data, function (i, item) {
                $("#Equipment").append(`<option value="${item.value}"> ${item.text}</option>`);
            });
            $('#Equipment').selectpicker({ liveSearch: true });
        });
    });
});

and I want to get separate data with 

 

json

public async Task<JsonResult> OnGetAssetDetailsAsync(string id)
        {
            var asset = await _context.WOAssetAssets.Where(s => s.WOAId == id).SingleOrDefaultAsync();
            return new JsonResult(asset.AssetName, asset.AssetManufacturer);
        }

and updated jquery

 

$(function () {
    $("#Asset").on("change", function () {
        var categoryId = $(this).val();
        $("#Equipment").empty();
        $("#Equipment").append("<option value=''>--Select Equipment--</option>");
        $.getJSON(`?handler=Equipment&id=${categoryId}`, (data) => {
            $.each(data, function (i, item) {
                $("#Equipment").append(`<option value="${item.value}"> ${item.text}</option>`);
            });
            $('#Equipment').selectpicker({ liveSearch: true });
        });
        $.getJSON(`?handler=AssetDetails&id =${categoryId}`, (data) => {
            $("#AssetName").append("asset.AssetName");
            $("#AssetManufacturer").append("asset.AssetManufacturer");
        });
    });
});

but is not working. How should I do it?