Missing tags in DevEco Studio, HarmonyOS - huawei-mobile-services

I am using DevEco Studio 2.1.0.501 IDE. I want to create a simple LITE watch application for smart device.
1, Is there any way to use more languages like java or kotlin (I don't really like JS)? I came from Android Studio.
2, I want to use this separator or divider tag : https://developer.harmonyos.com/en/docs/design/des-guides/separator-0000001053499780 but it looks like the IDE can't recognize that. Or this : https://developer.harmonyos.com/en/docs/design/des-guides/scrollbars-0000001053181026
Also a lot other tags can't be recognized. Why? This document is outdated or the IDE is outdated?
Thanks,
Leslie

For question 1, Lite version does not support Java or Kotlin.
For question 2, please refer to this document for information on supported tags. It is true that not all HMTL tags are supported or recognized by the DevEco Studio/HarmonyOS projects

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