Configure Cookie Injection
There are some instances when a cookie being present on every request is desired, such as specifying an sap-ssolist cookie to provide additional information to the authentication process. The steps to configure cookie injection for a route in a Link instance are:
Open up the Link application running in SAP BTP
Click the User-Provided Variables navigation link

Specify a new variable with the:
name:
ROUTE__<name>____Cookie
value: cookie value in a semi-colon ( ; ) delimited list of cookiename=cookievalue
Restart your application for the new setting to take effect