The following custom field types is provided by Project Metadata:

CWX Project Metadata Value Field by custom field and issue type (Read Only)

Displays a metadata value for a single issue type of the current project, by setting the metadata key to <customfieldName>_<issuetypeName>. This field is read only.

CWX Project Metadata Value Field by custom field (Read Only)

Displays a metadata value of the current project, by setting the metadata key to <customfieldName>. This field is read only.