Rich text string functions not working except length

[code-ishwar]

Hi,

I am trying to add javascript text functions from form variable to show in rich text. But only length function works.
This works: {{value}}
This works: {{value.length}}
This doesn't work : {{value.split(",")[1]}}
Can you please help if there is a way to manipulate text in screen builder rich text element?
Also I want to apply the similar functions for visibility rules of the fields.
Please advice