Select2 dropdown in block setting

[nirraval]

How to use select2 dropdown in block setting?

[HansSchouten]

It should be:

'options' => [
    ['value' => 'select_layout', 'label' => 'Select Layout'],
    ...
],

or:

'options' => [
    'Select Layout',
    'Left Side Gallery With Animation',
    ...
],

[nirraval]

Is there any way to select multiple values from the dropdown instead of one? Right now we can select only one option but we would like to select multiple items from the dropdown.

[HansSchouten]

At the moment this is unfortunately not possible.