How can I make trend line as a dotted line

Elastic Stack Kibana
1

I have used trend() function for generating the trend line.
How can I make that trend line as a dotted line?

I have one more question.
Is it possible to remove the background grid lines in the timelion charts?

2

I don't see any parameter to generate dotted lines in the lines documentation

Unfortunately, as per the .yaxis documentation, that is not possible.