Export custom csv file from Contentful app

We want customize possibility to download .csv file with configuration that needed for own aims.
By default contentful interface has built-in button ‘Export as CSV’ allows us to export data with particular fields in .csv file.

Do we have opportunity to create a script or include some libraries that will allow to add new button into interface of Contetnful and give us opportunity to download .csv file with custom pre-defined fields??