HarmonyOS webview如何调用地图定位能力，帮忙给下用法还有示例？

"requestPermissions":[  
{ "name": "ohos.permission.INTERNET" },  
{ "name": "ohos.permission.GET_NETWORK_INFO" },  
{ "name": "ohos.permission.LOCATION", "reason": "$string:app_name", "usedScene":  
  { "abilities": [ "FormAbility" ], "when": "inuse" }  
},  
{ "name": "ohos.permission.APPROXIMATELY_LOCATION", "reason": "$string:app_name", "usedScene":  
  { "abilities": [ "FormAbility" ], "when": "inuse" }  
}  
]

import web_webview from '@ohos.web.webview'; 
import { abilityAccessCtrl, common } from '@kit.AbilityKit'; 
import { BusinessError } from '@ohos.base'; 
 
let context = getContext(this) as common.UIAbilityContext; 
let atManager = abilityAccessCtrl.createAtManager(); // 向用户请求位置权限设置。  
atManager.requestPermissionsFromUser(context, ["ohos.permission.APPROXIMATELY_LOCATION"]).then((data) => { 
  console.info('data:' + JSON.stringify(data)); 
  console.info('data permissions:' + data.permissions); 
  console.info('data authResults:' + data.authResults); 
}).catch((error: BusinessError) => { 
  console.error(`Failed to request permissions from user. Code is ${error.code}, message is ${error.message}`); 
}) 
 
@Entry 
@Component 
struct WebComponent { 
  controller: web_webview.WebviewController = new web_webview.WebviewController(); 
 
  build() { 
    Column() { 
      Web({ 
        src: 'https://xxx-b-fat.huawei.com.cn/xxx/loanWeb/xxxx/amapFrame.html', 
        controller: this.controller 
      }).geolocationAccess(true).onGeolocationShow((event) => { 
        // 地理位置权限申请通知  
        AlertDialog.show({ 
          title: '位置权限请求', 
          message: '是否允许获取位置信息', 
          primaryButton: { 
            value: 'cancel', action: () => { 
              if (event) { 
                event.geolocation.invoke(event.origin, false, false); 
              } 
            } 
          }, 
          secondaryButton: { 
            value: 'ok', action: () => { 
              if (event) { 
                event.geolocation.invoke(event.origin, true, false); 
              } 
            } 
          }, 
          cancel: () => { 
            if (event) { 
              event.geolocation.invoke(event.origin, false, false); 
            } 
          } 
        }) 
      }) 
    } 
  } 
}