Using values of other items on the same host in web.page.get[]?

[rtVW]

Is doing something like this supposed to (not) work?
The official templates are available I suppose.

-
uuid: c3fc7c6ad54c4aa38cd4e3082dc9186e
name: 'Rabbitmq Overview'
key: 'web.page.get[127.0.0.1,/api/rabbitmq/overview,9292]'
history: '0'
trends: '0'
value_type: TEXT
preprocessing:
-
type: REGEX
parameters:
- '(\{.*\})'
- \1

-
uuid: ad48e8501b01013a5a416c3be5bd04b0
name: 'RabbitMQ node name'
type: DEPENDENT
key: rabbitmq.node.name
delay: '0'
preprocessing:
-
type: JSONPATH
parameters:
- $.node
master_item:
key: 'web.page.get[127.0.0.1,/api/rabbitmq/overview,9292]'

-
uuid: 0a46d204fd1a4b5cbd8e4fb4b1c7e351
name: 'RabbitMQ node info'
key: 'web.page.get[127.0.0.1,/api/rabbitmq/node_info/{rabbitmq.node.name},9292]'
history: '0'
trends: '0'
value_type: TEXT
preprocessing:
-
type: REGEX
parameters:
- '(\{.*\})'
- \1

[rtVW]

Discovery expects to receive a JSON array.