first add files

ProjectLiaisonForm/pages/textarea/card/index.js

@@ -0,0 +1,5 @@
+Component({
+  data: {
+    style: 'border-radius: 18rpx;',
+  },
+});

ProjectLiaisonForm/pages/textarea/card/index.json

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+{
+  "component": true,
+  "usingComponents": {
+    "t-textarea": "tdesign-miniprogram/textarea/textarea"
+  }
+}

ProjectLiaisonForm/pages/textarea/card/index.wxml

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+<view class="textarea-example">
+  <t-textarea
+    t-class="external-class"
+    label="标签文字"
+    placeholder="请输入文字"
+    maxlength="500"
+    indicator
+    disableDefaultPadding="{{true}}"
+    style="{{style}}"
+  />
+</view>

ProjectLiaisonForm/pages/textarea/card/index.wxss

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+.textarea-example {
+  margin: 0 32rpx;
+  border-radius: 18rpx;
+}
+
+.external-class {
+  height: 312rpx;
+}