How do i roll additional dice per level?

How do i get this macro to roll me additional dice per level? I am using this for my monsters random hit points when i roll initiative. example macro: [[2d8+2]] What i want is an additional d8 added per level. How do i do this?

If its d8 per level [[ ?{Level|1}d8 + 2 ]]  or if at 1 st  2d8 then 2d8 at 2 nd try this [[ 1d8 + ?{Level|1}d8 + 2 ]]

Thats it! Thank you!

If you are using the OGL sheet, and using levels (not CR) you can use: [[[[@{selected|level}]]d8+2]] This has the advantage of not requiring a rollquery. You merely need to have the token (representing a creature) selected. If you are using CR for your calculation, then the formula is: [[[[@{selected|npc_challenge}]]d8+2]] This rolls 1d8 per level or CR and adds 2 to the sum.