JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" class="chk-act" name="actionChk" value="17">
<input type="checkbox" class="chk-act" name="actionChk" value="18">
<input type="checkbox" class="chk-act" name="actionChk" value="19">
<input type="checkbox" class="chk-act" name="actionChk" value="20">
<input type="checkbox" class="chk-act" name="actionChk" value="21">

JavaScript

arr = ["18","20","21"];
$.each(arr, function(k,v) {
   $("input[value=\""+v+"\"]").prop('checked', true);
});