Need mage Fire Blast explosion macro

Can someone give me a macro where fire blast targets an Explosion add pls?

Can’t target Explosives via macros.

I figured if this worked for targeting adds below 30% health, you could target the explosions.
#showtooltip Scorch
/cast [@mouseover,harm] Scorch;[@Focus,harm] Scorch; [harm] Scorch

If explosives last long enough to need them set as focus you’re already dead.

If you’re just trying to create a mouseover macro this is a better way to write it: