Having same problem here.
Btw. a simple listbox (not a filterpane) can be created in that way (undocumented):
app.visualization.create('listbox', null, {
qListObjectDef: {
qDef: {
qFieldDefs: ['Month']
}
}
}).then(model => {
model.show('myDiv')
})
Astrato.io Head of R&D
