I'm working on creating a manual trigger for Epic Tickets to send out an a web request to slack where it would print all child tickets related to that epic and one customfield associated to each child ticket. Here is what i have currently.

Web Request (POST)
{ "blocks": [ { "type": "section", "text": { "type": "mrkdwn", "text": "{{#lookupIssues.summary}} {{/}}" } } ] }
End goal to have it print in this format:
- Child Ticket 1
- - Customfield value for child ticket 1
- Child Ticket 2
-- Customfield value for child ticket 2
Currently its printing out nothing. My current dummy ticket has one child ticket associated it to but can't get anything to print out.