That's a rather stupid idea the politicians are pushing.
If the tracking isn't in the chip itself, it can be removed by ditching the packaging.
If it is in the chip, that makes things even more screwy. First it will need a completely new design of the chip, you can't just slap something like that into pre-existing microcircuitry and expect things to remain the same. It introduces changes to power, EM sources, and heat.
Then there's the issues if it's a passive item like the RF tags a lot of stores use, that only respond when hit with the right field, like the one produced by those panels at the entry/exit. You'd need the transmitter/receiver to be close enough to the tags to both cause them to respond, and to pick up their transmission, something that isn't exactly hard to block or avoid.
On the other hand, it could be an active transmitter, a larger component to add, that will need some kind of antenna, a power source whenever it's supposed to be transmitting, and the fact that it will cause even more chaos to an integrated circuit if just slapped on, which will require even more research and development so it doesn't impair the functionality of the chip it's been foisted into than the more passive ones would need. Even then, it could be put in a shielded box and no longer be capable of being picked up remotely. If it's antenna is external at all, that can be broken so it's output signal is even weaker.
Of course you could always make a more powerful transmitter for it, but then you are inflating the size of unit again, as well as how much it can interfere with the function of the chip in the first place, and it can still have it's signal shielded, it just takes more shielding.
Perhaps make it so it only transmits when the chip is actually in use, that way it doesn't need a integrated power supply, but all the other issues remain.
And for that matter, China won't give a rodents donkey if you can detect they have the chips in their country, but they'll still shield the ones in sensitive locations they don't want you to know about. It's not that hard to put up a faraday cage around a room, a 40' trailer, or even an entire building if have government backing.
It all boils down to this. If the tracker is external to the chip, it will be removed. If it's internal to the chip, it's a completely unfeasible proposition in the first place that even if implemented would have little effect that can't already be easily negated if desired.