P: DNG Converter: Enable JPG conversion

Yes, that's the need of Gunther Wegner, the original poster.
If you read my post at the beginning of the discussion, the need to convert jpegs to DNG was different. To simplify that was to find a workaround to the limitation of the organizer which can't open selected jpegs directly in the ACR module. Only the editor can open in ACR. There are huge advantages in opening jpegs as well as raws in the ACR: not only quality, but to enable powerful and fast non-destructive batch editing. In recent Elements editor versions, the ACR module can open a big number of files, jpegs or raws. The limitation of the organizer does not exist with LR, Bridge, PS...
It's understandable that Adobe is reluctant to offer the ability to open jpegs in ACR in the organizer not to compete with LR; same for the DNGconverter ability to convert jpegs to DNG which would solve the problem. Note that I convert all my files, jpegs as raws in ACR.

I don't know anything about scripting, but I assume Elements can be scripted, since a number of add-ons like Elements+ or OnOne are managed via scripts. Elements+ even has scripts to edit layers in ACR or to restore full ACR options like HSL or lens correction which are not present in the limited version of Elements ACR.

Elements might be scripted, at least in the past (Pixel Genius had an Automate plug-in for Elements using scripts years ago). No idea if it can still do so, PG stopped supporting Elements a good 6-8 years ago. 

Can Elements be scripted, Michel? The underlying need is to automate the process.

Tip: using Elements (even old versions) as a third party jpeg to DNG converter.
- In the editor, menu File >> Open in camera raw
- select a whole folder of jpegs (I have not tested more than 100 files at the same time)
- click on the 'Select all' button on the top of the left side film strip.
- click on the 'Save' button and set your preferences, including choosing the destination folder.
- Wait for the conversion to be complete (very fast)
- click 'Cancel'
That's all.

Your request makes no sense and that’s why after so many years your getting no traction Günther!

A 3rd party app can call LR's URL handler and make LR automatically generate DNGs from JPEGs. You have full control over the process.

I think one can also automate Adobe's Media Encoder.

I'd be pretty surprised if Adobe made this change to what is a free tool intended for a very specific job.  But life is full of surprises.

I'll add another plus. You can't accidentally save over a DNG, but you can a JPEG. If the JPEGs are your "original", then it's another safeguard.

Oh, and you can have a validation hash too, of course.

I think it's up to Adobe to set priority on its inclusion.

I guess you are not from Adobe, so why bothering? It's not helpful at all for our request.

The product has one role: to convert raw to DNG. 
The product has no provisions for rendering raw to anything rendered. That's what ACR/LR are for. 
IF they had some auto convert raw to JPEG, you'd have no idea what you'd get. It be akin to the default conversions of the raws for previews in ACR or LR. Without presets! 
Might as well extract the existing rendered JPEG from the camera that exists in the raw! Might as well ASK Adobe to do this; provide/embed an existing rendered JPEG from the raw when converting to DNG. Not turn the DNG converter into a raw converter to produce a JPEG (what size??). It's a free product to provide a path from proprietary raws. Nothing else. 

I know all of this. The advantage would be, that I'd have the JPG data inside the container along with the Dng preview that has the xmp-data for development applied.
Trust me, for the whole timelapse community it would be important to have this feature. Since it's already in Lightroom (Classic and before), it shouldn't be a major issue to allow the Dng Converter to do that JPG wrapping too.