How to save a property in OKTA application

Questions
1

In this Create Application,

Is there any field to put a custom value of our own…currently we are getting this custom value(string) from some other call…we want it as a part of application property and get it in the OKTA list applications call

2

Do you mean like an Application Profile attribute? Have you checked out the technique covered in this guide that shows how to add a profile to an application (and not to an app user): Okta Help Center (Lightning)

You add the attribute via the /apps endpoint, and you can retrieve it again using the same call.

3

Thanks for the reply,I dont think this could solve our problem
we have a string value say id : "x2-afr",we are currently getting this id from some other call
We want to somehow put this value into OKTA app and retrieve it from /app/{appId} call