Yes. See Jira entity properties.
Subsequent to this thread, I noticed @AITMOUSSAMohamed also posted an elaboration of his use case mentioning secure REST API integration. Please be aware these are “wide open” values that any app can access by knowing the key. As such both entity property pages warn:
You should never store private or personal data in entity properties.
Please do not store API Tokens (Atlassian or external) into entity properties.