Dear Community,
I am reaching out to seek guidance on importing .csv files into Jira Service Management in Cloud. Our objective is to efficiently create multiple JIRA issues under a single Epic, with the issues being populated using the data provided in a .csv file.
The challenge arises with the custom fields designated as asset object types. The import process is unsuccessful when the data for these asset object type fields is presented in a format that is readily understandable by humans.
To better understand this, I conducted the process inversely by exporting issues that contain asset object custom field values into a .csv file. Upon examination, I noticed that the data for asset object custom fields appears in an unusual format:

Could someone explain to me the nature of this format?
Additionally, I am interested in learning if there is a viable method to import issues from a .csv file that includes asset object field values without encountering errors. And one more unpleasant piece of information: Custom fields are multi-select type 
Appreciate your time and assistance on this matter.
Best regards,
Matej