token-exchange endpoint to have KEYCLOAK SESSION cookies

[broshsha]

Keycloak version : 16.1.1
Frontend : @react-keycloak/web

I am trying to implement keycloak impersonation using the token-exchange feature. I am successful to invoke the token-exchange endpoint and I have got the response containing access-token for the user to be impersonated. However, to establish the user session in the frontend, I need the keycloak session cookies namely KEYCLOAK_IDENTITY_LEGACY, KEYCLOAK_SESSION_LEGACY, AUTH_SESSION_ID_LEGACY which are missing the token-exchange endpoint.
I have also implemented keycloak SPI to create a custom rest endpoint which is able to invoke the token-exchange endpoint.

How do I set the keycloak session cookies in the response of the custom rest endpoint?