Tutu Emoji Toolbar is an Obsidian plugin that lets you quickly search for and insert emojis in editors, titles, file rename fields, context menus, and mobile usage scenarios.

After enabling the plugin, you'll find a command/hotkey entry called Tutu Emoji Toolbar: 打开 Emoji 选择器. Set this to whatever you like. Once triggered, it lets you search through a list of emojis.
Start typing a word to filter through the list. You can insert the emoji into the editor by either clicking on it, or use the arrow keys and then press enter to insert the emoji.
Download or build the plugin from tinswangtao-web/tutu-emoji-toolbar, then copy main.js, manifest.json, and styles.css into:
<your-vault>/.obsidian/plugins/tutu-emoji-toolbar/