How to change the size of a CustomFieldEdit rendering custom UI

Forge Forge Modules and Product Triggers
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I have a Forge app with a CustomField module. The edit screen is rendered via Custom UI. This causes my ReactJS app to be rendered in a modal view. But the contents of my ReactJS app are too large for the default modal size. How can I change the width and height of the modal view that renders my CustomUI? If this was UI Kit, I would set the width property on the CustomFieldEdit component. But I don’t have those properties available to me.

manifest.yml

modules:
  jira:customField:
    - key: jira-lookup
      name: Systems
      description: A custom field to lookup entities
      type: string
      collection: list
      formatter:
        expression: "`${value.name}`"
      readOnly: false
      resolver:
        function: edit-issue-resolver
      function: main
      edit:
        resource: edit
resources:
  - key: edit
    path: static/edit-lookup/build
    tunnel:
      port: 3000