Combo Chart with stacked bars won't let me create a "Total" line on it.

I would like to create combo chart of product categories by month to see the trends. For this I want to use stacked bar chart ( stack - 100% ) and have a line that will show total amount of product sold. Right now there are amounts for every category but is it possible somehow to make a line that will be calculated using summarized amounts?

I have tried another approach:

• Summarize by Created at: Month and measure "Sum of Total"
• Join the same table by Created at: Month and then summarize by Created at: Month and Product category. As measures I use "Sum of Total" which is grouped by joined table period and category and them min/max "Sum of Total" from first table.
  This way I have period and category for X - axis and Amount by category and Total by Month as Y - axis but Metabase won't allow to use 2 dimensions for x and y axis at the same time.

To Reproduce

1. Go to Sample database and select orders
2. Summarize by Created at: Month and Products category. As measure create "Sum of Total"
3. Select Combo chart and on Display tab : Stack - 100%

Expected behavior

If nothing specified, a line should appear showing a total amount of column values.

Logs

No response

Information about your Metabase installation

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    "vendor": "Google Inc."
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    "java.vendor": "Eclipse Adoptium",
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    "java.version": "11.0.24",
    "java.vm.name": "OpenJDK 64-Bit Server VM",
    "java.vm.version": "11.0.24+8",
    "os.name": "Linux",
    "os.version": "6.1.85+",
    "user.language": "en",
    "user.timezone": "UTC"
  },
  "metabase-info": {
    "databases": [
      "mysql",
      "sqlserver",
      "h2",
      "bigquery-cloud-sdk"
    ],
    "hosting-env": "unknown",
    "application-database": "postgres",
    "application-database-details": {
      "database": {
        "name": "PostgreSQL",
        "version": "13.6 (Ubuntu 13.6-1.pgdg20.04+1)"
      },
      "jdbc-driver": {
        "name": "PostgreSQL JDBC Driver",
        "version": "42.7.3"
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    "run-mode": "prod",
    "plan-alias": "",
    "version": {
      "date": "2024-12-09",
      "tag": "v0.52.2.1",
      "hash": "35a4c28"
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    "settings": {
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}

Severity

annoying

Additional context

No response

Start by reproducing the issue in the Sample database using Orders, grouping by Created at: Month and Product category, then open the Combo chart Display tab and select Stack - 100%. Done means the chart can show a line representing the total of the stacked column values, with behavior defined for the unspecified case; no source file or test is named in the issue.