How can the "Custom Parameters" be utilized with the 'Journal Entries Report' and 'Account Analysis

From the SLA manual:

Parameters
The parameters in some of the following reports are categorized as follows:
• Selection parameters: filter the information retrieved by the report

• Custom parameters: used to pass information to the template, such a boilerplate text or formatting options

The custom parameters described in the table below apply to all the Subledger
Accounting reports.

Custom Parameters
Parameter Token Required Valid Values
Custom Parameter 1 P_CUSTOM_PARAMETER_1 No No validation
Custom Parameter 2 P_CUSTOM_PARAMETER_2 No No validation
Custom Parameter 3 P_CUSTOM_PARAMETER_3 No No validation
Custom Parameter 4 P_CUSTOM_PARAMETER_4 No No validation
Custom Parameter 5 P_CUSTOM_PARAMETER_5 No No validation