Impossible to change margin bottom in timeline title

[wc-davide]

TuSimple/naive-ui version (版本)

2.33.3

Vue version (Vue 版本)

3.2.39

Browser and its version (浏览器及其版本)

Brave (latest)

System and its version (系统及其版本)

Windows 10

Node version (Node 版本)

Reappearance link (重现链接)

https://codesandbox.io/s/solitary-butterfly-j8wvni?file=/src/Demo.vue

Reappearance steps (重现步骤)

Try to override the "titleMarginMedium" property of timeline and check it's css properties, it has an hardcoded margin-bottom 6px which can't be overrided

Expected results (期望的结果)

titleMarginMedium should have a default value of "0 0 6px" instead of hardcoding the margin-bottom

Actual results (实际的结果)

margin-bottom is hardcoded thus it's impossible to change that margin

Remarks (补充说明)