So, if I understood you correctly, exporting to JPEG is your last step? You never sharpen the exported JPEG, correct?
From the hi res Master file > Crop, flatten,
Save as > Sharpen > Save for Web. Save for web will create an sRGB JPEG file, but you need to check/tick the relevant boxes to ensure the file is fit for purpose.
Things have come a long way since then Sid, folk will now add sharpening during NR, I prefer not too, Smart sharpen tended to be rather aggressive years back, now it has improved, plus you need to open the window and go
advance and address those extra boxes, I personally prefer USM and have always used it. When I print I use the sharpening in Lr for print and what is specified for the printer and output from the hi res master file. This is why I like Lr & PS as everything is all under one roof and no need to search.
Sid, my advice would be get the basic building blocks right, and keep a simple workflow, once Mastered then explore. The Web is full of good stuff, it is also full of incorrect stuff, you just need to know what is correct and distill. PP is a constant leaning curve, as software develops. My Workflow is simple, but follows a logical pattern. If you start lurching from
Pillar to Post, with Dave says this, Mary says that, you will become like a deer caught in the headlights, not knowing which direction to run to.