I tried something like this ${TXU}↖{⏜}$ but the arc is coming size of one letter
Sorry, jqMath doesn't do horizontal stretching yet. For advanced formatting like this I suggest you try MathJax, at least for now. (I am the jqMath author.)
Finally i am able to resolve by using \html in jqMath and CSS to stretch.
${TXU}↖{ \html "<span class='stretch'>⏜</span>"}$
and the CSS is
.stretch{ transform: scale(3,1); -webkit-transform: scale(3,1); display: inline-block; }
Hope this helps some one.
Sorry, jqMath doesn't do horizontal stretching yet. For advanced formatting like this I suggest you try MathJax, at least for now. (I am the jqMath author.)