Add shift modifier here?

[hasnogaems]

I have

/targetenemyplayer
/startattack

for targeting enemy players.
And

/targetenemy
/startattack

for targeting all types of hostile, in a separate macro binded at the same button as 1st macro + shift.

Can I add shift modifier in first macro and make them 1 macro? Something like:

/targetenemyplayer
/[mod:shift] targetenemy
/startattack