bold function doesn't work in Typescript
Hello, so I'm working on Angular project and I have a function in a typescript file that bold a specific part
      formatText() {
      ...........
      
      new_text = part1 +  word.bold()  + part2;
      return new_text;
  }
then I called I returned in an HTML file
                <div *ngFor="let sentence of sentences">
                <li>
                    {{formatText()}}
                </li>
               </div>
However what I get is the tags instead of bolding the word like this:
A young college teacher <b>leaves</b> China for the United States in search of a better future.
 
     
    