unable to split the folder name value in jinja file

Hi Team,

I'm doing project factory automation in jinja file, However i faced issue while split the folder name and folder id from folder api. Please find the below steps for more details

step1: I have created a folder using below code and it is successfully created.

resources:
- name: {{ properties['foldername'] }}
type: gcp-types/cloudresourcemanager-v2:folders
properties:
{% if properties['isorg'] == "yes" %}
parent: organizations/{{ properties['orgid'] }}
{% else %}
parent: folders/{{ properties['parentfolderid'] }}
{% endif %}
displayName: {{ properties['folderdisplayName'] }}

Step 2: once created i need the folder id to parse the value in parent->id of project.

- name: {{ properties['projectid'] }}
type: gcp-types/cloudresourcemanager-v1:projects
properties:
projectId: {{ properties['projectid'] }}
parent:
type: folders
id: $(ref.{{ properties['foldername'] }}.name).split('/')[1]

I'm getting error that above split command, it is not working. Kindly assist me how to split the above value>

Example:
Output of Inline reference value for newly created folder name is : core/123456789
I want to split foldername is core and folderid is 12345678 with above jinja file.