There should be a possibility to create/update an existing list of custom labels for the `mod-kb-ebsco-java` module.
method. Please see the description for this method by following link RM API documentation
To support update operation we need to modify ModuleDescriptor with additional endpoint
update the corresponding raml file and provide implementation.
`folio-holdingsiq-client` module already contains methods to communicate with RM API custom labels endpoints
Implementation of custom labels backend in mod-kb-ebsco(Ruby) - https://github.com/folio-org/mod-kb-ebsco/pull/86
The length of custom filed label should not be more than 50 characters - https://issues.folio.org/browse/UIEH-184
Unit and API tests