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#1. Convert the chart to a dual-axis by adding a line using the same measure used in the bars. Remove all dimensions from the color mark for this line so that you see only 1 single line as required.
#2. If you can Union the baseline data with the current data, then you should be able to include this data too in the same axis as above.
#3. This too hopefully can be included along with #2, if not, the data may need to be pivoted.
If you still need help, please share the data and packaged workbook so that someone can provide the appropriate solution unless there are limitations with your data source(s).