Hi, you cannot add existing interactive filters - but you can easily create a filter with same capabilities in new Platfrom Analytics Dashboards: https://www.servicenow.com/docs/bundle/yokohama-now-intelligence/page/use/par-for-workspace/task/sel...
In similar way you cannot add existing content block to new dashboards but for the basic block (like static html) you can use rich text component in Platform Analytics dashboards. More complex content blocks are not supported.
For more advanced use cases you can use technical dashboards and there you will have more options of the types of content you can add as well as interactions you can achieve between different elements of a dashboard.
