Uses of Eval in combination with Chartable

Hello,

   I'm Trying to define a condition that if it exists then it can chart the traffic speed

Similar to the below

${eval: defined("valueState") == 1 ? "Value Status :  $value" : ""}

But Adding to it for example

${eval: defined("valueState") == 1 ? "Value Status :  ${chartable: #.## : $value}" : ""}

or 

${eval: ${valuestate} == "" ? "Value Status :  ${chartable: #.## : $value}" : ""}