Is there any way to sort external plugins (like camelcrusher, waves stereo imager for instance) in Logic Pro X?

For example I'd like to create my Metering section with iZotope, s(M)exoscope and so one so forth...how?

 

Logic Pro X > Preferences > Plug-in manager

Top left where is says "category" there is a small + sign. Click to create a category.

For instance: "Effects"

If you want to nest subcategories:
Create another category: "Effects:Imaging"
Then create: "Effects:Reverb"

Now go top left to Show All tab, search for Imager and drag it to Effects:Imaging category
And search for H-Reverb and drag it to Effects:Reverb

Empty categories and subcategories do not appear on Logic's menu. You can nest even more like "Effects:Reverb:Impulse"