Hi,

Try this,

def fields_view_get(self, view_id=None, view_type='form', toolbar=False,
                    submenu=False):
    result = super(ClassName, self).fields_view_get(view_id=view_id,
                                                    view_type=view_type,
                                                    toolbar=toolbar,
                                                    submenu=submenu)
    all_fields = {}
    xml_form = etree.Element('form', {'string': tools.ustr('Test')})
    all_fields['new_field_name'] = {
        'type': 'many2one',
        'string': 'String For Field',
        'relation': 'co_model_name',
    }
    etree.SubElement(xml_group, 'field', {
        'name': 'new_field_name',
        'nolabel': '0',
        'colspan': '4',
        'options': "{'no_create': True, 'no_open':True}",
    })
    root = xml_form.getroottree()
    result['arch'] = etree.tostring(root)
    result['fields'] = all_fields
    return result

Thanks