tinkerun: Dynamic Snippet Form problem

Hi, At first, thanks for your efforts doing this great app.

Today I have an idea about to make Snippet Form dynamic, so I did something like this:

use App\Models\User;

$users = User::selectRaw('first_name as label, id as value')->get()->toArray();

$field_user = [
    'value' => '',
    'label' => 'User',
    'description' => 'Select a user.',
    'type' => 'select',
    'options' => $users, 
];

But as soon as I click the Snippet Form button, I get this white empty screen:

I was trying to populate the User select from the DB, also I was planning to use the $field_user value as an input for a second DB query, so the chosen value for $field_user will customize the result of the second query!

I know maybe the feature was not design to work as I wanted, but when I think about it, supporting dynamic Snippet Form will make the possibilities endless for Tinkerun

Also another request: I will be grateful if you implemented a self-update feature in Tinkerun, so we always have the latest and greatest without checking Tinkerun website every week or so