html - target specific line of text in <p> before <br> -

i'm running edits on person's site , they're asking if can edit first line of repeatable p element. here's example of built:

<p> cum soluta nobis eleifend option congue nihil imperdiet doming id. <br> cum soluta nobis eleifend option congue nihil imperdiet doming id. <br> cum soluta nobis eleifend option congue nihil imperdiet doming id. </p> 

so question - without having change or add html, able target first line of text css?

first-line pseudo element can that, check browser compatibity here https://developer.mozilla.org/en-us/docs/web/css/::first-line

p::first-line {    color: red;  }

<p>    cum soluta nobis eleifend option congue nihil imperdiet doming id.    <br>cum soluta nobis eleifend option congue nihil imperdiet doming id.    <br>cum soluta nobis eleifend option congue nihil imperdiet doming id.  </p>