The combinations are typically 220-240v in and 8-12v out,

By putting the transformer there, I need to buy the door chime(And thus ding dong when the door bell is pressed)

I don't know if you read, but "Bro Ozak" recommended on the last post to just buy a transformer and use that, and not what you proposed.
Also, you don't seem to try and understand the requirements either, since like I said, there isn't a 240V main supply doorbell with built in transformer that has a secondary voltage between 16V - 24V. The two combinations that I can find upon hours of research were:
220V-240V main supply - 8V-12V secondary voltage
110-120V main supply - 16-24V secondary voltage
The combination that I need to make this work - seeing that we're in Malaysia, and our mains is 220V-240V, and the August Doorcam requiring 16V-24V does not exist as one of the combinations.
Hence I can't just "buy an AC doorbell" because the combination required does not seem to exist.
You're also spreading misinformation by saying that the switch voltage should be 24V or lower, AC or DC. Firstly, AC is required and DC does not work. Secondly, it clearly states 16V-24V, and anything lower than that will not power the doorbell up. That means I can't just "buy an AC doorbell" which secondary voltage is 8V-12V and use it since it won't be enough power for the doorbell.

Now, I am trying to get a feedback to see if the transformer I linked should work as well, based on Ozak's last post regarding the fact that I can just use a transformer at the end point instead of a AC doorbell with built in transformer.
Uh, okay. I'm sure you've tried explaining what's needed to the wireman and they have accepted the job before.
What arrogance in determining that I am paying less money. Before the money conversation even comes up, they already rejected saying they don't have the expertise to do it, or that it's hard to find a suitable transformer. Don't know what your comment serves other than to be negative when you know nothing of the facts.

As with your prior random "warning" about wiring up the doorbell at 230V outdoors when my entire circuit is indoors within a condo, it clearly shows that you do not read at all and just try to be a smartass here. You're contributing nothing and is spreading misinformation towards others that might be using this resource next time to wire up their own units.

Wouldn't something like this be much easier?
https://my.rs-online.com/web/p/plug-in-power-supply/7300247/

If no skill, than don't touch at all. Keep on looking for the electrician that can do it for you. I don't understand what so difficult with such easy wiring. Probably you didn't explain much to them or your explanation to them too complicated ?

Your outdoor should have the doorbell wiring already. Given the picture you post. There is no hacking or wiring to do at all. Please check your outdoor where the wiring goes. Either the developer leave the wire like that (picture) for outdoor or already have a wall mount doorbell socket switch. Take out that doorbell switch and replace with the cam.

Even I show you the wiring below picture, you still have to use multitester to check and confirm the wiring which is which. Cause that yellow wire can make people mistake and confuse. (There are too close).

Sorry I don't understand your connection.

What I understand about TS is his August cam require power to run. The August cam is all in 1 doorbell. The August Cam is wifi to router and to TS phone.

So no chime or doorbell switch. Not require at all.

The connection will be

The AC Supply => adapter => wire to the outdoor => the August cam.

Hope not kill him. 

on the inside