How to use JavaScript to concat child records into a single field?

The field needs to be a Rich Text Formula field. You have a Text Formula field currently.

I tried with Rich Formula Text Field. but I'm not successful.
I'm getting result as

The code is generating two <li> bullets.

More than likely you have not set the parameters correctly for your application. These parameters are from my demo application:

  //parameters:
  var dbid = "bkgzxdr4x";
  var dbidParents = "bkgzxdr6t";
  var dbidChilds = "bkgzxfptb";
  var apptoken = "q2aznmd9h7eymbwavpzjbsc8hcf";
  var n = 100;
  var relatedParentFid = "7";
  var relatedParentLabel = "related_parent";
  var clist = "3.7.10";
  var qbuClass = "QBU_Childs";

The Two dots are actually the data from comments fields of child table. 

• aaa
• bbb

But, its just showing 

•  
•  

its not pulling the data from the child table. What can be the possible reason.
I have Identified that I should be using App. specific dbids, fids and apptoken.

What is "QBU_Childs"?

I just implemented the solution with some additional sorting using a slist: and it works very well.

Thanks Dan for you scripted solution it works really well and what's even better is I really don't know how to use Javascript but with Dans good support notes I was able to work it out.