There is addon with some limitations, but it helps alot:
https://www.curseforge.com/wow/addons/spinx-focus

Save "focus" for each toon like this:

/focus
/script SetRaidTarget("target",7);
...
/focus
/script SetRaidTarget("target",8);

And cast any CC spell after this on each toon with macro:
/click SFB
/cast Polymorph

Dont work with mobs with same names, but anyway it helps alot.