How to assign permissions to Exchange shared mailbox ?

Hello everyone!

I'm trying to setup provisioning for Shared Mailbox in an Exchange Hybrid environment (although my question is relevant for any Exchange infrastructure, on-prem, Hybrid or Cloud, I guess).

In the documentation (here) I've found the way to give users the "Send on behalf of" permission on a mailbox, however I couldn't find any way to give users the "Send as" and "Full Access" permissions (which are available in Exchange, as per this Microsoft documentation page).

Is this supported by 1IM ? If so, how is it done?

Thanks in advance for the help!