is this the correct way to specify multipple optional config files in application.yml for a grails 6 app?

spring:
    config:
        import: >
            optional:file:${PATH_EXT_CONFIG:-/app/config}/application.yml,
            optional:file:${PATH_EXT_CONFIG:-/app/config}/application.groovy,
            optional:file:${PATH_EXT_CONFIG:-/app/config}/custom-application.yml