To convert a timestamp of the form `mm:ss` to seconds using Zsh, you can use the following steps:

1. Split the timestamp into its individual components, minutes and seconds, using the `split` command.
2. Multiply the minutes component by 60 to convert it to seconds.
3. Add the seconds component to the minutes component to get the total number of seconds.

Here is a Zsh function to convert `mm:ss` to seconds:

```zsh
function mmss_to_seconds() {
  local minutes seconds total_seconds

  # Split the timestamp into minutes and seconds.
  minutes=$(echo "$1" | split ":" | head -n 1)
  seconds=$(echo "$1" | split ":" | tail -n 1)

  # Convert the minutes component to seconds.
  minutes=$(($minutes * 60))

  # Add the minutes component to the seconds component to get the total number of seconds.
  total_seconds=$(($minutes + $seconds))

  # Return the total number of seconds.
  echo "$total_seconds"
}
```

To use the function, simply pass the timestamp in `mm:ss` format as an argument. For example, to convert the timestamp `02:30` to seconds, you would use the following command:

```zsh
mmss_to_seconds "02:30"
```

This would output the following:

```
150
```

You can also use the function in your own Zsh scripts or functions. For example, the following script converts a list of timestamps in `mm:ss` format to seconds:

```zsh
#!/bin/zsh

# Get the list of timestamps from the user.
timestamps=$(echo "Enter a list of timestamps in mm:ss format, separated by commas:" | read -s)

# Split the list of timestamps into individual timestamps.
timestamps=(${(z)split , "$timestamps")})

# Convert each timestamp to seconds.
seconds=()
for timestamp in $timestamps; do
  seconds+=($(mmss_to_seconds "$timestamp"))
done

# Print the converted seconds to the console.
echo "The converted seconds are:"
for second in $seconds; do
  echo "$second"
done
```

To use the script, simply save it as a file with a `.sh` extension, such as `mmss_to_seconds.sh`, and then make it executable by running the following command:

```zsh
chmod +x mmss_to_seconds.sh
```

Once the script is executable, you can run it using the following command:

```zsh
./mmss_to_seconds.sh
```

The script will then prompt you to enter a list of timestamps in `mm:ss` format, separated by commas. Once you have entered the list of timestamps, the script will convert each timestamp to seconds and print the converted seconds to the console.
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