Pebble filters applied to JSON inputs produce non-JSON strings

[aku]

Describe the issue

If you have a JSON field, e.g.

inputs:
  - id: payload
    type: JSON
    defaults: |-
      [{"name": "single quote in string '"}]

and want to apply pebble filters such as replace or escapeChar the resulting string will loose JSON formatting.

"{{ inputs.payload | escapeChar('single') }}" -> [{name=single quote in string \'}]

if you do the same against STRING field it will produce expected result [{"name":"single quote in string \'"}]

I.e. when you use pebble filters with JSON it gets serialized to string which is non-json compliant

Context and examples: https://kestra-io.slack.com/archives/C03FQKXRK3K/p1720800171410189

Example:

id: json_vs_string_filtering
namespace: dev
inputs:
  - id: payload_json
    type: JSON
    defaults: |-
      [{"name": "single quote in string '"}]
  - id: payload_string
    type: STRING
    defaults: "[{\"name\":\"single quote\" in string '}]"
tasks:

  - id: debug
    type: io.kestra.plugin.core.debug.Echo
    format: "{{ inputs.payload_json | escapeChar('single') }} \n {{ inputs.payload_string | escapeChar('single') }}"

Environment

• Kestra Version: 17.8
• Operating System (OS/Docker/Kubernetes):
• Java Version (if you don't run kestra in Docker):

[smunteankestra]

reproducing, will be prioritised in 0.19.0 release