Format for QoQ

Hi,

i wrote a Expression as per below , in below expression i want to add "Pts" at end of expression .

and if final output value is in Negative sign it should show it in Brackets.

Var QoQ_Per = DIVIDE(CALCULATE([Var Cur_Val_Per] - [Pre_Val_Per]),[Pre_Val_Per])

 

example : my output value is coming as -0.01

 

for that i want to add like below  (0.01 pts) as it is in negative sign it should show it in brackets.

if its in postive sign then it should show value as it is from expression . example: 0.03 means it should show 0.03pts