OR operator between different attributes

[pkoevesdi]

Is it possible to connect different attributes with OR? For instance, if I want to have a list of all issues, where the current user is either author or assignee? I tried it like this:

{{ref_issues(-f:author = [current_user],-f:assigned_to = [current_user])}}

but confirming with the documentation, these produce an AND conjunction.
Also I tried

{{ref_issues(-f:author|assigned_to = [current_user])}}

which is kind of intuitive, but leads to an error message.
We migrated from trac, there it works with an "or" between the arguments like this:

[[TicketQuery(reporter=$USER,or,owner=$USER)]]

If an OR conjunction is not possible, I'd like to put this as a feature request. :-)