Not getting manually entered data inside service invocation call

How can we access manual input data that is entered in the configuration page inside the request made by a service invoke call?

We thought of saving that manual input data on the app side in some database during the save configuration invocation.

Is there any better way for our scenario so that we can directly access the input data in the service invoke request body without the need of saving it on the app side in a database?

We are able to get the field values from the schema for a product list using input parameters of record definition but we are not able to get a manually entered data (as shown in the screenshot below) without saving it on the app side in a database and fetching it back during service invocation from the database.