Adding a Stacked Graph with Line, making whole chart stacked

[brucewayne_now]

I have created a first question and stacked it. That will look like below diagram.

Then I have another question for which I use "line".

Now am trying to use "add series". The expected result is stacked graph interpolating with line graph. But instead of that, I am observing a whole new "stacked" graph.

[nllho]

Hey, I think you're looking for this feature request. You can click to help the team prioritise.

[brucewayne_now]

Seems that is first raised in 2020, still no solutions for that. Any alternative way to achieve the requirement ?? @flamber