Spring 3.1.0 supports SSLBundles (good!). The properties for it are defined here:

/**
 * Properties for centralized SSL trust material configuration.
 *
  ...
 * @since 3.1.0
 */
@ConfigurationProperties(prefix = "spring.ssl")
public class SslProperties {

The metadata for this seems to be missing (?):

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

In VSCode I see:

Unknown property 'spring.ssl'

for this config in application.yaml

---
spring:
  ssl:
    bundle:
...
...

BTW runtime wroks, no issues.