How to use the eval command correctly

I am in doubt about how to use the EVAL command.
I have channel in the twitch I want to create a command that when the user enters a certain word the response of the bot is:
You caused certain damage eg:
! addcom! damage $ (touser) Caused $ (customapi http://2g.be/twitch/randomnumber.php?=defstart=1&defend=100) of damage.
What I need is for the command to run and output a specific result like 15. The bot adds a specific response.
Can someone help me?

@apoio82

This command setup uses $(eval) to output a random number between 1 and 100:

!addcom -cd=5 !damage $(touser) caused $(eval Math.ceil(Math.random()*100)) damage.

Thank you.
I need to know how to do it when the number 15 comes out. The bot complements the answer.

I am not sure I understand what you are asking. Could you please explain further?

When the command is type !damage
The bot responds - > you caused xx damage.
When this damage is number 15. It adds an answer
You caused xx damage. Congratulations.

!addcom -cd=5 !damage $(eval a=Math.ceil(Math.random()*100);b=a==15?` Congratulations.`:``;`You caused ${a} damage.${b}`)

<3 <3 <3 <3 Thank you

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