Adding filament changes during sequential prints

[Eulenbaer]

Is your feature request related to a problem? Please describe.
Printing multi part objects utilizing sequential print option currently does not allow for the insertion of custom gCode.
Therefore, the option to print multiple parts on a single job, but with different colors / filaments is somewhat unnecessarily complicated, although a sequential print option is available.

Describe the solution you'd like
Option to insert custom gCode into sequential print jobs.

Describe how it would work
Similar to how filament change option already works in non-sequential jobs.

Describe alternatives you've considered

• Splitting a single job into multiple jobs. Works, right, but seems inconsequential if both options, automatic filament change and sequential print are available.
• Buying an MMU ... obviously the prefered option, not necesssarily the most budged friendly option :)