How can I get a macro to change a roll of 1 to a 2?

I have a character in a 5e with a feat that changes rolls of 1 to 2.  I found where I can reroll, but I don't want it to reroll, I just want it to be changed to a 2.

You could use the  Keep / Drop function, e.g. to k eep the h igher 1 between 1d8 and 2: [[ {1d8, 2 + 0d0}kh1 ]]

Thank you

Is there a way to make this work for casting spells at a higher level? In 5e, casting fireball, for example.  

The simplest way is probably to use an advanced Roll Query : Fireball damage: [[ {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 ?{Spell Slot| 3, | 4, + {1d6,2+0d0}kh1 | 5, + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 | 6, + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 | 7, + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 | 8, + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 | 9, + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 + {1d6,2+0d0}kh1 } ]] fire