You can convert the Jpeg's to DNG in two ways in Lightroom.
1. At the time of importing the jpeg's images in Lightroom, select the option "Copy As DNG" from the top panel and then import.
2. If you have already imported the images in Lightroom as jpeg, then select the images in Library Module >> Click on Library Menu from the top menu >> Convert Photo to DNG
Let us know if that helps.
I thank you for your kind response!
I will try your suggestions, thanks again very much !!
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Your Most Welcome..Michael
There is no benefit to convert JPGs to PNG. There is no quality benefit.
Just import the JPG photos into Lightroom (as JPGs).