My registrar #ArubaIT still doesn't support that in the web interface, but they were nice and fast doing that manually when I opened a ticket.
And thus, finally, after many years of wait this is finally possible:
% drill -T6 aaaa lapo.it | fgrep AAAA
lapo.it. 86400 IN AAAA 2a01:4f8:151:1d7::7
PS: unfortunately ldns’
drill does not yet show glue records explicitly during a trace, but I will wait on that too.