How to convert a raw image to jpeg and save in the same album in Lightroom?

I have made a number of raw photo's and imported them into Lightroom. Then, I do some modifications (e.g. denoise, adjust colors/light etc.). After that, I would like to convert the raw, modified image to a JPEG and save it in the same album in Lightroom (I convert to JPEG to save storage space). 

I cannot find a way to do so. There is the possibility to export, but there is no option to choose to export to the same album. There is not even an option to save to Lightroom at all. The only thing I can do is to export to a folder on my Macbook.  On internet, I found that Lightroom Classic has this option. But I use Lightroom 7.0 (not Classic).

Does anyone know what to do? Thanks a lot!