As we know that Gib play simple Ogust -- Ask Feature in some side suit.
For this hand,after my answer is 3♥ showing values in ♥,3♠ Gib N rebid is alerted as "1+♠,15hcp+,18 total points".
I think this is a impossible descriptive bid,moreover,it is illogic.
The reasons are
1- Gib only play simple Ogust -- Ask Feature in some side suit,whatever basic or advanced Gib,so I guess Gib will be difficult to handle after pd's weak two bid in many of complicated hands because "Ask Feature" can't show trump quality exactly.
If it is just 1-card ♠ support,Gib N must have other 5-card suit to bid (and forcing a round),I believe Gib can't handle it well when play trump contract.
2- Whenever play trump contract,we always keep 8-card suit fits as possible,if it is just 1-card ♠ support,Gib will pick up 3nt as a final contract driectly after 2nt ask bid.
I suggest 2nt - Ogust convention:
3♣ :Bad hand, bad suit
3♦ :Bad hand, good suit
3♥ :Good hand, bad suit
3♠ :Good hand, good suit
3NT:AKQxxx in the bid suit.

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