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The other source data import won't work in eazyBI as you seem to have expected it. While there is an option to add additional data to the Jira issues cube, this option doesn't support adding new dimensions or new members. This option only allows you to import new measures (numerical values) or properties and tie them to existing dimensions and their members.
With the data mapping you shared in the screenshot, the data is imported in a separate data cube - "All Project". You can analyze the imported data there.
If you want to add this additional data to the Jira issues cube, please specify a unifying parameter that you have in both sources - the additional data and the Jira issues cube. From the screenshots, it seems like you want to add data for Projects. If you can get the Project keys into the additional data, you can import the additional information into the Jira issues cube and tie them to the Project dimension "Project" level. Refer to the above-linked documentation page for more details.