jinja2 include files based of of dict variable - ansible

Question

I'm trying to create a templated file with jinja2 and ansible
currently i have a dict with multiple entries e.g:
internal_sites:
- {name: "site1" ,url: "site1.example.com" }
- {name: "site2" ,url: "site2.example.com" }
- {name: "site3" ,url: "site3.example.com" }
- {name: "site4" ,url: "site4.example.com" }
I have a a directory that has multiple files eached also named after the value in 'name'
├── templates
│ ├── base.cfg.j2
│ └── services
│ ├── internal
│ │ ├── site1.txt
│ │ ├── site2.txt
│ │ ├── site3.txt
│ │ ├── site4.txt
Within base.cfg.j2 im trying to loop over each item in internal_sites which generates the appropriate config i require and at the same time im trying to include the content of the text files.
the instructions i have are as follows:
{% for site in internal_sites %}
acl {{ site.name }} hdr(host) -i {{ site.url }}
use_backend {{ site.name }} if {{ site.name }}
backend {{ site.name}}
{% include "templates/services/internal/"{{lookup('vars', site.name)}} %}
{% endfor %}
however whenever i run my ansible i get the following error;
FAILED! => {"changed": false, "msg": "AnsibleError: template error while templating string: expected token 'end of statement block', got '{'. String: \n{% for site in internal_sites %}\n acl {{ site.name }} hdr(host) -i {{ site.url }}\n use_backend {{ site.name }} if {{ site.name }}\n\n backend {{ site.name}}\n {% include \"templates/services/internal/\"{{lookup('vars', site.name)}} %}\n\n{% endfor %}\n"}
i have also tried with the following
{% for site in internal_sites %}
{% set fileloc = 'templates/services/internal/' + site.name %}
acl {{ site.name }} hdr(host) -i {{ site.url }}
use_backend {{ site.name }} if {{ site.name }}
backend {{ site.name}}
{% include {{fileloc}} %}
{% endfor %}
I'm aware this is likely wrong but could anyone shed some guidance on the most appropriate way to do this?
expected output
acl site1 hdr(host) -i site1.example.com
use_backend site1 if site1
backend site1
contents of site1.txt
are included
here