You can get an array of CustomAttributeNames as a property of a Requirement Set, then use inspectAttribute to query the Information for a given Custom Attribute.
Here is a quick example leveraging the example from the inspectAttribute page in our documentation:
slreq.load('crs_req_func_spec');
rs = slreq.find('Type','ReqSet');
addAttribute(rs,'MyCheckbox','Checkbox','Description',...
'This checkbox attribute can be true or false.');
addAttribute(rs,'MyEdit','Edit','Description',...
'This is an Edit field');
customAttributeNames = string(rs.CustomAttributeNames)';
customAttributeInfo = arrayfun(@(x) string(inspectAttribute(rs,customAttributeNames(x)).description), 1:numel(customAttributeNames))';
tableForExport = table(customAttributeNames,customAttributeInfo,'VariableNames',["Custom Attribute", "Info"])
From here you can use writetable to export to Excel.
