As I said I dont think BMW will let Vinfast to build the engine, similar like I dont think Mitsubishi let Proton to produce their engine. But in Indonesia case, it is Toyota itself who owned the factory in Indonesia.
That picture that I posted here is the engine manufacturing process in casting plant in Indonesia. You just can look on the link I provided and try to use Google Translate to understand the reporting. That is coming from Indonesian news.
Here is the prove that the engine produced in Indonesia is exported to so many countries. Even Indonesian made engine is exported to Toyota home based which is Japan.
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TMMIN plants produces two gasoline and ethanol engines: TR (Sunter Plant #1 & #2) and R-NR (Karawang Plant #3). There are two types of TR engine made from iron, 1TR and 2TR. These machines are used for car with IMV (Innovative Multipurpose Vehicle) type like Fortuner and Innova. Furthermore, R-NR engine which is made from aluminum, also has two types, 1RN and 2RN. These engines are used for sedan like Yaris, Vios & MAV (Multi Activity Vehicle) like Sienta. Both engines are produced not only for domestic market but also for many countries in the world.
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https://www.toyotaindonesiamanufacturing.co.id/manufacturing/product/engine