Suggestion

It would be extremely helpful if we were able to create filters for use with dashboards, etc. where a project type or category matched certain criteria.

This would allow us to create a core, servicedesk, or software specific dashboard which would amalgamate all issues between different projects together based on this criteria.

Workaround

Option 1 - using project categories

Jira natively supports the labeling of projects through the use of project categories:

• Defining a project

Once you have added the category of your choice to your projects, for example "JSM" category, you can use that on JQL:

• Advanced searching - fields reference

category = "JSM"

Option 2 - Plugin alternatives

Some plugins may provide extra JQL functionality to search for it. If you already have ScriptRunner it's possible to use the following:

To search by Project Type, you may use ScriptRunner Custom JQL function projectsOfType:

project in projectsOfType("service_desk") // or "business", "software"

See the docs for details: https://docs.adaptavist.com/sr4js/latest/features/jql-functions/included-jql-functions/projects

Or JQL Booster Pack:

https://marketplace.atlassian.com/apps/1218367/jql-booster-pack

This app comes with  categoryMatches() / projectsOfType() functions