Is it possible to call the header value as a parameter for the method applied to the same object in simple interpreter, Spring DSL for Apache Camel?

Is it possible to call something like this in Apache Camel's Spring DSL

 <setHeader headerName="timestampPart3"><simple>${header.timestampPart2.substring(0, ${header.timestampPart2.length()} - 2)}</simple></setHeader>

or like this

 <setHeader headerName="timestampPart3"><simple>${header.timestampPart2.substring(0, header.timestampPart2.length() - 2)}</simple></setHeader>

For the second attempt it identifies .length() - 2 as a single method name call

You can increment and decrement with simple, so...

I wouldn't recommend, but for example:

<setHeader headerName="timestampPart2_1">
    <simple>${header.timestampPart2.length()}--</simple>
</setHeader>

<setHeader headerName="timestampPart2_1">
    <simple>${header.timestampPart2_1}--</simple>
</setHeader>

<setHeader headerName="timestampPart3">
    <simple>${header.timestampPart2.substring(0, ${header.timestampPart2_1})}</simple>
</setHeader>