Helpers
Helpers, sometimes called handlebars, are functions that allow you to perform basic text transformations within your template.
In the JavaScript->before rendering content option a user can register custom handlebars.
The Dynamic Text panel has plenty of predefined handlebars that are registered automatically and ready to use.
{{contains}}
Checks if a given value exists within an array.
{{date}}
Formats the timestamp in a given field using a date format. Uses helper-date.
The field value must be a Unix timestamp or any of the formats supported by the date.js library.
{{eq}}
Checks two strings for equality.
{{join}}
Joins all elements of an array into a string using a given separator.
{{json}}
Supported since Dynamic Text Panel 2.2.0.
Presents an object (JSON) or an array as a formatted string. Markdown supports the syntax highlighting.

Transformation
The JSON
helper expects an object or an array to display it as a formatted string. If the data source returns a string it should be transformed to a JSON object using the Convert field type
transformation.

{{split}}
Supported since Dynamic Text Panel 2.2.0.
Splits a string into an array using a given separator.

{{toFixed}}
Formats the given number using a fixed-point notation.
{{startsWith}}
Supported since Dynamic Text Panel 4.2.0.
Returns true if the variable starts with a specified value. Example:
|Name| My Value| |---|---|
{{#each @root}}
{{#if (startsWith @key "My_")}}
| {{@key}} | {{this}} |
{{/if}}
{{/each}}
{{endsWith}}
Supported since Dynamic Text Panel 4.2.0.
Returns true if the variable ends with a specified value. Example:
|Name| My Keys| |---|---|
{{#each @root}}
{{#if (endsWith @key "_key")}}
| {{@key}} | {{this}} |
{{/if}}
{{/each}}=
{{match}}
Supported since Dynamic Text Panel 4.2.0.
Returns true if the variable matches with a specified value. Example:
|Key| Value| |---|---|
{{#each @root}}
{{#if (match @key "^(Country|Street|Post)")}}
| {{@key}} | {{this}} |
{{/if}}
{{/each}}