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Yep the bolt is separate. I’ve bought anchors from TradeInn before, they have lots of different options. https://www.tradeinn.com/trekkinn/en/climbing-equipment-wall-equipment/14523/s
At a climbing wall they’ll generally have two bolts connected with a chain and a fixed carabiner. That way if either of the two bolts fails, you are still attached to the wall without falling very far or shock loading the remaining bolt.
https://m.petzl.com/INT/en/Professional/Anchors/COEUR-BOLT-STEEL
If your rope hangs out the window make sure that whatever part of it is touching the window and under pressure is sheathed and protected so it can't be cut.