=||= If not, will it do so in future?
no
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You can have third-part Construct 2 add-ons in Construct 3 by asking their authors to port them using the SDK.
Otherwise, check the Exchange Addon or this dedicated forum to see if a port already exists.
Finally you can try this beta converter.
Once you have a Construct 3 version of the add-on, you can install it using the add-ons manager.