Dynamic Columns Based on Joins

[swarrenwecareconnectorg]

I'm working on an application that allows users to have custom fields associated with each user based on options their organization selectes. I need to be able to display a set of fixed columns (first name, last name, email, etc) and the custom fields in the same laravel-livewire-tables table. I'm struggling with how to set this up in this library.

In my public function builder() function I loop through all the possible fields and add them as a join.

$builder = User::whereActive(1);

foreach ($this->subscriber->customFields as $field) {
     $joinAlias = "field_{$field->id}";
     $builder->leftJoin("user_values as `{$joinAlias}`, "{$joinAlias}.user_id", "users.id");
}

Then I'm stuck when I create the columns function

public function columns(): array
{
    $columns = [
        Column::make(__("First Name"), "firstName")
            ->searchable()
            ->sortable(),
        Column::make(__("Last Name"), "lastName")
            ->searchable()
            ->sortable()];
    foreach ($this->subscriber->customFields as $field) {
         // what goes here??
    }

    return $columns;
}

I've tried aliasing the name of the column in the builder and putting the "{$joinName}.value" and they both try to load as a relationship when it's a value I want to pull from the query.

Any ideas?