The IRegionSelect component may be used to select IAMC variables from ixmp4.

By setting the dynamic-filter prop the component can be set up to reactively filter the available variables based on the given IExplorerFilter - which includes a variable, region and run filter.
show-all can be used to control whether variables are grayed out when no data exists with the given dynamic-filter .
Additionally pre-filter and pre-select can be set similar to IRunSelect .