The official Grafana documentation for an OIDC (oAuth) login can be found here:
https://grafana.com/docs/grafana/latest/setup-grafana/configure-security/configure-authentication/generic-oauth/

The documentation is quite self-explanatory, but the most important configuration changes for SRAM (PRD) are:

auth_url = https://proxy.sram.surf.nl/saml2sp/OIDC/authorization
token_url = https://proxy.sram.surf.nl/OIDC/token
api_url = https://proxy.sram.surf.nl/OIDC/userinfo

The client_id and client_secret will be supplied by the SRAM team.

The redirect_uri that SRAM needs to properly configure the application is the so called callback URL:
https://[hostname]/login/generic_oauth

JMESPath expressions can be tested here https://jmespath.org/