Want to add red color bar to Additional comments field and activity on Work Order form

[BhargavY]

Hello everyone,

I have a requirement to add red color bar to field level and activity level. So i achieved field level configuration by creating  UI Macro and UI Formatter. Please see the below screenshots for your reference.

But i can't able to add color to activity level 

I have used one macro code that is mentioned below, If i use this it is overriding all activity bars to red, but i want color code for only Additional comments activity . see the below screenshot.

Macro Code: 

<jelly xmlns:j="jelly:core">
<style>
    /* Input field styling */
    textarea[data-stream-text-input="comments"] {
      box-shadow: inset 4px 0 0 0 red !important;
      padding-left: 12px !important;
      box-sizing: border-box !important;
    }

    /* Activity entries - force red color on all accent bars */
    .sn-card-component_accent-bar {
      border-left-color: red !important;
      background: linear-gradient(to right, red 4px, transparent 4px) !important;
    }
</style>
</jelly>

Can anyone help me with the solution top add red color bar only to Additional Comment field on activity level?

Thanks in advance!