A 'true' accounting format is not possible I believe, because it is not possible to have numbers on the right and a currency symbol on the left in one cell. I am not experienced with accounting but I have seen a number of people inquire about this . The most commonly proposed workaround used to have a very narrow column alongside containing just the currency symbol. When you are looking at the preset formats, you can manually edit the format code at the bottom. If you press the help button, there is a good explanation of all the various options, and it is not as hard as it seems to create unique formats, especially when you can base them on the existing precepts.In regards to your situation, here is a format code based on the "positive and negative numbers" section of the help manual:
The first section is related to positive numbers, and hence contains the brackets, the second section is related to negative numbers, and you can remove the "red" if you want, and the last section is for numbers equal to zero.
To make this format a permanent feature of your Calc, you must edit the default template
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