How to change/add options in adhoc filter variable in newly created datasource plugin with backend?

I have been creating a grafana’s custom datasource plugin with backend. When i wanted to update/change things for the query variable screen, i was able to do that by creating a file and component called VariableQueryEditor and setting it as VariableQueryEditor in my module.ts using

export const plugin = new DataSourcePlugin<DataSource, QueryObj, DataSourceOptionsObj>(DataSource)
  .setConfigEditor(ConfigEditor)
  .setQueryEditor(QueryEditor)
  .setVariableQueryEditor(VariableQueryEditor);

Now i wanted to update and add some text fields/dropdowns to ad-hoc filter query variable but i am unable to find out a way to do that?
When we select variable type as ad-hoc filer, we just get an option to choose the datasource. Cant we add some more fields to be sent while querying for ad-hoc filters?

Thanks

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