How to pass login_hint / Subject in SAML with Okta?

Hi. For a smooth experience, I’d like to pass the username entered in Auth0 login UI into the Okta login UI, so it would be pre-populated when the user is redirected to it.
I found that in SAML integration with Okta, the login_hint query parameter isn’t read by Okta.
However, it is possible to write the username into the SAML request in Subject field and then it might be populated.
See here: Okta Help Center (Lightning)

However, I’m not familiar with how to edit the SAML authentication request.
Is there any documentation on the variables available in it?


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