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after some research got a solution for this , add new property "value" in addField method with the value you need. see the example:

        $fieldset->addField(
            'user_image',
            'image',
            [
                'name' => 'user_image',
                'label' => __('Image'),
                'id' => 'user_image',
                'title' => __('Image'),
                'value' => $value_that_you_need,
                'required' => false,
                'note' => 'Allow image type: jpg, jpeg, png'
            ]
        );

i hope it will help same of you ..