Have a way to use `--cost` option for income-expense reports

[avh4]

Is your feature request related to a problem? Please describe.

I'm tracking billable hours with entries that (after csv import) look like:

2023-01-01 Billable hours
    revenue:hours    -8.00 hr @ $7.25
    assets:billable

Currently hledger-flow report produces income-expense reports with hledger --file import/user/all-years.journal --period 2023 incomestatement --pretty-tables --depth 2 which results in showing the "hour amount" balances for the "revenue:hours" account.

For my standard report, I want to use hledger's --cost option so that those reports only show the dollar amounts instead of hours.

I'd be happy if hledger-flow simply did this by default, or if there were some way to define additional hledger options to use for the income-expense report (or for reports in general).

Version and Runtime Information

hledger-flow 0.14.4 darwin x86_64 ghc 9.0 UNKNOWN

If your request includes commands you ran and the output, please also include the runtime options with --show-options e.g:

$ hledger-flow --show-options import
RuntimeOptions {baseDir = "/home/user/finances/", importRunDir = "./", importStartYear = Nothing, onlyNewFiles = False, hfVersion = "hledger-flow 0.14.4 darwin x86_64 ghc 9.0 UNKNOWN", hledgerInfo = HledgerInfo {hlPath = "/home/user/.nix-profile/bin/hledger", hlVersion = "hledger 1.25, mac-x86_64"}, sysInfo = SystemInfo {os = "darwin", arch = "x86_64", compilerName = "ghc", compilerVersion = Version {versionBranch = [9,0], versionTags = []}, cores = 8, availableCores = 8}, verbose = False, showOptions = True, sequential = False, batchSize = 200}
Collecting input files from /home/user/finances/import/
Found 12 input files in 0.005646s. Proceeding with import...
Wrote include files for 12 journals in 0.014143s
Imported 12/12 journals in 0.136004s

Our Example Statements Repository

FYI, we have a repo with some example transactions which you can use to run hledger-flow on: https://github.com/apauley/hledger-flow-example

Can you give examples of what you would like by running hledger-flow on these files?

Example csv file:

date,hours,rate,comment
2023-01-01,8.00,7.25,

Example rules file:

skip 1
fields date,_hours,_rate,comment

account1 revenue:hours
amount1 -%_hours hr @ $%_rate
account2 assets:billable

Describe the solution you'd like

One of:

• hledger-flow uses --cost in all reports by default
• there's some way to use a config file or an environment variable or a command-line option to make heldger-flow use --cost (or perhaps any arbitrary additional hledger options) in the income-expense reports (or perhaps in all reports)
• have a new report that's the same as income-expense, but includes --cost

Describe alternatives you've considered

• I'm installing hledger-flow with nix, so I could possibly apply a patch to https://github.com/apauley/hledger-flow/blob/master/src/Hledger/Flow/Reports.hs#L65 to build a custom version of hledger-flow. Imo, this isn't ideal since I'd prefer for my files to remain 100% compatible with the official hledger-flow version.
• I could make my own shell script that generates the report, but will have to duplicate the work hledger-flow already does of iterating over each available year. (Possibly a separate feature request, it would be cool to have a way to define new reports that heldger-flow would run for all years.)

Additional context Add any other context or screenshots about the feature request here.