a bit o' spruce, from http://play.spruce.cf

spruce.json

{"flavor":"1.29.0","prune":["meta"],"env":["HOME=/home/user"],"cherry_pick":[],"yaml":[{"filename":"first.yml","contents":"--- # first.yml\nvars:\n  WEBFRONTEND_VALUES:\n    ingress:\n      rules:\n        - host: sv.fin.be.ch\n          http:\n            paths:\n              - backend:\n                  serviceNameSuffix: refapp1frontend-http\n                  servicePort: 80\n                path: \"/io/refapp1/frontend/\"\n\n"},{"filename":"second.yml","contents":"--- # second.yml\nvars:\n  WEBFRONTEND_VALUES:\n    ingress:\n      rules:\n        - host: sv.fin.be.ch\n          http:\n            paths:\n              - (( append ))\n              - backend:\n                  serviceNameSuffix: frontend-http\n                  servicePort: 80\n                path: \"/io/shell/frontend/\"\n"}],"skip_eval":false,"fallback_append":false,"go_patch":false,"debug":false,"trace":false}