How to pass parameters in Open CTI Run Apex method from CTI Flow block?

I am trying to call apex class from CTI flow and pass the chat message/content to apex class.

Please refer the documentation https://developer.salesforce.com/docs/atlas.en-us.api_cti.meta/api_cti/sforce_api_cti_runapex.htm

below is my class

global class GetChatMessageFromAdaptor {    global static void fetchUserinput(String strUserInputMsg){        system.debug('===strUserInputMsg========'+strUserInputMsg);    }}

Here it is mentioned that we have to use like

name=acme&phone=(212) 555-5555

But the chat message/content is dynamic not like "acme" static value.

strUserInputMsg=$.actions.uid-11.results.content

or

strUserInputMsg=$.actions.uid-11.results.value

I am trying to access the value and assigning to strUserInputMsg parameter

CTI Flow Configuration screenshots