An example of the capabilities of the Template field, in this case we save the fields to a config file. The saving process itself may vary.
    Template::make('Config', 'config')->fields([
    Text::make('Var'),
    Text::make('Bar'),
])
    ->changeFill(fn(mixed $data) => config('test'))
    ->changeRender(fn(mixed $value, Template $ctx) => FieldsGroup::make($ctx->getPreparedFields())->fill($value))
    ->onApply(function(mixed $item, mixed $value) {
        $content = str_replace(['array (', ')'], ['[', ']'], var_export($value, true));
        file_put_contents(config_path('test.php'), "<\?php \n\nreturn $content;");
        return $item;
    })
    
    Template::make('Config', 'config')->fields([
    Text::make('Var'),
    Text::make('Bar'),
])
    ->changeFill(fn(mixed $data) => config('test'))
    ->changeRender(fn(mixed $value, Template $ctx) => FieldsGroup::make($ctx->getPreparedFields())->fill($value))
    ->onApply(function(mixed $item, mixed $value) {
        $content = str_replace(['array (', ')'], ['[', ']'], var_export($value, true));
 
        file_put_contents(config_path('test.php'), "<\?php \n\nreturn $content;");
 
        return $item;
    })
Template::make('Config', 'config')->fields([
    Text::make('Var'),
    Text::make('Bar'),
])
    ->changeFill(fn(mixed $data) => config('test'))
    ->changeRender(fn(mixed $value, Template $ctx) => FieldsGroup::make($ctx->getPreparedFields())->fill($value))
    ->onApply(function(mixed $item, mixed $value) {
        $content = str_replace(['array (', ')'], ['[', ']'], var_export($value, true));
        file_put_contents(config_path('test.php'), "<\?php \n\nreturn $content;");
        return $item;
    })
Template::make('Config', 'config')->fields([
    Text::make('Var'),
    Text::make('Bar'),
])
    ->changeFill(fn(mixed $data) => config('test'))
    ->changeRender(fn(mixed $value, Template $ctx) => FieldsGroup::make($ctx->getPreparedFields())->fill($value))
    ->onApply(function(mixed $item, mixed $value) {
        $content = str_replace(['array (', ')'], ['[', ']'], var_export($value, true));
 
        file_put_contents(config_path('test.php'), "<\?php \n\nreturn $content;");
 
        return $item;
    })
Template::make('Config', 'config')->fields([
    Text::make('Var'),
    Text::make('Bar'),
])
    ->changeFill(fn(mixed $data) => config('test'))
    ->changeRender(fn(mixed $value, Template $ctx) => FieldsGroup::make($ctx->getPreparedFields())->fill($value))
    ->onApply(function(mixed $item, mixed $value) {
        $content = str_replace(['array (', ')'], ['[', ']'], var_export($value, true));
        file_put_contents(config_path('test.php'), "<\?php \n\nreturn $content;");
        return $item;
    })
 
config/test.php
    return [
  'var' => 'foo',
  'bar' => 'test',
];
    
    return [
  'var' => 'foo',
  'bar' => 'test',
];
return [
  'var' => 'foo',
  'bar' => 'test',
];
return [
  'var' => 'foo',
  'bar' => 'test',
];
return [
  'var' => 'foo',
  'bar' => 'test',
];