I got the following to work. I put the nodes and aliases into Lists so I could use the IEnumerable methods, Where and Any. Just set the root to whatever node you want.

@using umbraco.MacroEngines
@inherits DynamicNodeContext
@try
{
    dynamic root = Library.NodeById(-1);
    DynamicNodeList list = root.Descendants();
    
    List<DynamicNode> descendants = new List<DynamicNode>(list.Cast<DynamicNode>());
    List<string> aliases = new List<string> {"umbHomepage", "umbTextpage"};

    var filtered = descendants.Where(n => aliases.Any(a => a == n.NodeTypeAlias));
    <ul>
    @foreach (var node in filtered)
    {
        <li>@node.Name</li>
    }
    </ul>
}
catch (Exception e)
{
    @e.ToString()   
}