syntribos-openstack-templates/glance/image_data/put_image_data.template

PUT /v2/images/{image_id:CALL_EXTERNAL|syntribos.extensions.glance.client:get_image_id:[]|}/file HTTP/1.1
Accept: application/json
Content-Type: application/octet-stream
X-Auth-Token: CALL_EXTERNAL|syntribos.extensions.identity.client:get_scoped_token_v3:["user"]|

{"variable":"test data"}