How can we append a new text to a already existing text in Multi line custom field in Jira?

[Vinod Mendem]

In a transition, I am adding some text to a multi-line text custom field. On another transition, I need to add a new text to the same custom field the older text is getting replaced with new text. 

Is there a possibility that we can append the new text to already existing text in the custom field.

Currently, I am using Jira cloud.

[Alexey Matveev]

Hello,

It is not possible out of the box. You would need an app  like Power Scripts, ScriptRunner, Automation for Jira and so on.

If you want to use the Power Scripts app, you can add a SIL post function with a code like this:

#{Custom Field Name} = #{Custom Field Name} + " your text";