In the same row or in the same cell?
Cells is a linked list of TCells that form a row. Each TCell is a single cell in that row.
To put them in the same row but different cells, you need to create a TCell for each thing you want to add, like
$cells->add(new TCell($STATS));
$cells->add(new TCell($FEEDEAR));
etc... (you have four columns it seems from the header, so you can only add four Tcells)
To put them in the same cell, I believe there is no other way other than putting it all inside a Comment and then the comment inside the TCell, like
$comment = new Comment("{$variableHere} blablabla <img src='link.png'> blablabla");//comments can have html
$cells->add(new TCell($comment));