I just made some tests with LEGO Dimension. They use NTAG213 - Amiibos use NTAG215. They are basically the same (NTAG213 has less banks).
You CAN use the Amiiqo to clone LEGO Figurines!
The problem is that the LEGO chips have some read-locked blocks so you can't read them out like an amiibo.
All vehicles and non-character chips are using the same chip & data on it. (The batmobile one is a bit different though...)
You build the object ingame by using a character of the fun/level pack and write it to an empty chip -> even the batmobile chip you got in the starter pack.
Writing vehicles/objects to the Amiiqo DOES NOT WORK.
The written data sadly is in the read-locked area.
Cloning characters is working, but only because the game reads a character once and saves the RFID UID in your savegame.
If you then use the amiiqo with a dump of the chip, you use the same UID and thus are able to use the character with the amiiqo.
Bank switching does not work, so set the slots to 1 and use the first slot.
You can read the level/fun packs through the package.
You can't read the chips with the Amiiqo App, you have to use NFC TagInfo or MIFARE++ Ultralight.
I used MIFARE++ Ultralight and then converted the hex text to a bin.
Altough I wrote the complete data to the amiiqo, writing the UID should be enough.
As soon as the authentication algorithm is broken, a perfect clone should be possible with a minor firmware update.