Idp 3.3.2 Response/Assertion/Issuer @Format

[Fabrizio Guidotti]

For italian SPID project we need in SAML Response -> Assertion -> Issuer 
to have Format attribute even if it's the default one. I know SAML2 say 
it's optional in this case.

Now we have:
           <saml2:Assertion ID="_5f15e170fa85fcb80c0baa93769a2da6" 
IssueInstant="2018-12-04T11:51:49.323Z" Version="2.0"
xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
<saml2:Issuer>https://myidp.example.it/idp/shibboleth</saml2:Issuer>
....

We need:
           <saml2:Assertion ID="_5f15e170fa85fcb80c0baa93769a2da6" 
IssueInstant="2018-12-04T11:51:49.323Z" Version="2.0"
xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
                     <saml2:Issuer 
Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity">https://myidp.example.it/idp/shibboleth</saml2:Issuer>
....

Is it possible to configure the IdP to format saml:Issuer in SAML 
Responses this way?

Thanks
Fabrizio