TL/DR: It is not cost effective at all for 3rd parties to manufacture the kind of integrated LED headlights used by modern cars because a single light would cost around low 1000s of dollars (2-5 lacs PKR), and from a consumer perspective, there is very little point to getting such an expensive aftermarket headlight.
Standard car headlight bulbs mostly fall into a few standardized categories based on their sockets and overall size and shape. You've probably seen H4, H7, H1, H3, 9005, 9006 etc. as the light types.
The actual light emitting substance inside these bulbs can be Halogen, HID, Xenon, LED etc. and they can either be reflector type or projector type bulbs.
Vast majority of the cars manufactured in the 50+ years have a bulbs of one of these types and then there is the glass and plastic housing around the bulbs for the full headlight assembly.
Since these bulbs are standardized across all vehicle manufacturers and designed to be replaceable, a lot of 3rd party manufacturers and suppliers exist for them and they are cheap and easy to replace in most vehicles. This is what you're used to in most cars here in Pakistan as well.
Modern LED Headlights are completely different, however.
These modern lights that have started to become popular in that past 10 or so years on newer cars use LED PCBs that are custom designed for each vehicle model, and usually have an integrated controller, and then these are packaged into sealed headlight assemblies which includes the full glass, plastic and metal housing.
For a 3rd party manufacturer to offer a replacement LED headlight assembly of this type, they'd need to:
Have custom molds designed for each vehicle they want to support (injection molds for the plastic and glass housing etc.), which costs anywhere from $100,000 to $1,000,000 from China depending on how complex the design is, and sealed headlight assemblies are very complicated because they need to be waterproof etc.
Have custom LED PCBs designed and manufactured for each vehicle they want to support. This includes getting LEDs fabricated along with required heatsink and cooling considerations. And since most people replacing a headlight usually do so because they want higher LUX output, they'd need more powerful LEDs here, which means more heat output and a larger cooling solution required. This would also likely mean alterations to the headlight assemblies from point 1 to accommodate the larger heatsink.
Reverse engineer the integrated controller and it's electrical and software protocols so that the car's ECU is able to recognize the modified headlight assembly and doesn't start to throw errors.
Still somehow price the final product below what OEM manufacturers charge for their replacement units.
Now, I'm not saying this isn't doable, but it isn't cost effective. You're looking at development costs ranging between $100,000 to $10,000,000 (depending on the model and complexity) for each individual model (and Jolion HEV and regular Jolion are two different models because they have different headlights).
Then you have to add manufacturing costs on top, which is the actual BOM cost of manufacturing a single headlight afterwards, and indirect costs like packaging, shipping, warehousing, marketing etc.
And to get a final MSRP, you need to forecast how many units of the headlight are you going to sell in it's lifetime so that you can spread out the development costs over each unit.
Most vehicles sell between 10,000 to 500,000 units in their entire lifetime of a particular model and something like a Jolion isn't going to have sales of more than 100,000 for a particular variant because they get facelifts every couple of years. And out of that a very small minority would even consider replacing their headlights by a 3rd party (likely between 1-5% at best).
So based on all of this, you're looking at a likely price of something around $1,000s range for a single headlight.
