$xxxxx$ into mathematical formulas. If your content isn't a math formula, but contains multiple $, it may fail to parse and not display correctly.{{$.step.element}} to refer to the value of a loop variable. When step ID is 2, the value of the current loop is {{$.2.element}}\ before the $ sign for escape, for example -{{$.step id.element}} to refer to the value of a loop variable. When step ID is 2, the value of the current loop is {{$.2.element}}ment}}.