label position not works on toggle type in formly material

[wizardnet972]

Description
labelPosition: 'before' not works. the MatSlideToggle api:

@Input()
labelPosition: 'before' | 'after'

Whether the label should appear after or before the slide-toggle. Defaults to 'after'.

 

Minimal Reproduction

   {
      key: 'Toggle',
      type: 'toggle',
      templateOptions: {
        label: 'Toggle label',
        description: 'Toggle Description',
        required: true,
        labelPosition: 'before', //<--- not works.
        attributes: {
          labelPosition: 'before', //<--- not works.
        }
      },
    },

https://stackblitz.com/edit/angular-ffeq7y?file=src%2Fapp%2Fapp.component.ts