Bug with import/export of pipelines for text, images, and multi-modal data

[nicl-nno]

In the current implementation, the export of chains designed for text, images, and multi-modal data is not stable. Trasformations of several spefic models raises errors during export to JSON.

The addinal tests should be added and the modification of import/export should be implemented if necessary.

[nicl-nno]

@andreygetmanov pls check is it still actual