Filter for Classifications on /Roles endpoint

Dear Developer community,

we are looking for a way to apply a filter on the /Roles endpoint which allows us to solely GET roles which have a certain classification set.
Is there a supported way to apply a filter on classifications on the /Roles endpoint?

From another thread ( Filter entitlements for an application for a user - IdentityIQ (IIQ) / SCIM API - SailPoint Developer Forum) we see that the attribute filtering syntax is not supported: e.g. attrPath "[" valFilter "]".

We also tried stuff like e. g.:
scim/v2/Roles?filter=(urn:ietf:params:scim:schemas:sailpoint:1.0:Role:classification.name co “XXX”)
scim/v2/Roles?filter=(classifications co “XXX”)
but with no luck up to now.

Any help is highly appreciated.
Thank you.

Kind regards,
Daniel

Just in case anybody else also wants to filter on classifcations on bundles via /Roles endpoint:
We found that the following filter expression works for us:

/scim/v2/Roles?filter=(classifications.classification.name eq “ABC”)

Best regards,
Daniel