how to use select and extract date into month and year from timestamp in sequelize ORM?

[wawasm]

Issue Description

I have this query in sql:
select to_char (created_at,'Mon') as month, extract (year from created_at) as year, id_activity as activity from event group by 1, 2, 3

i tried to understand and make a simple sequelize query out of mysql query shown. I did something like this:
model.findAll({ attributes: [[ sequelize.fn('extract(year)', sequelize.col('created_at')), 'data']] });
however, it does not work.
i played around other aggregate function using 'sum', 'min', 'max'.. it does work.
how could i resolve this?..
thank you so much

StackOverflow / Slack attempts

https://stackoverflow.com/questions/60849911/how-to-use-select-and-extract-date-into-month-and-year-from-timestamp-in-sequeli

Additional context

Add any other context or screenshots about the issue here.

Issue Template Checklist

Is this issue dialect-specific?

• No. This issue is relevant to Sequelize as a whole.
• [/ ] Yes. This issue only applies to the following dialect(s): XXX, YYY, ZZZ
• I don't know.

Would you be willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time and I know how to start.
• [/ ] Yes, I have the time but I don't know how to start, I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.

[sushantdhiman]

Please use Github Issue Tracker only for reporting bugs, requesting new features or discussions. Ask questions on Stackoverflow sequelize.js tag or Slack. While I would like to help answer any questions but it still take too much time.

If you are reporting a bug please isolate it as SSCCE, present it nicely and follow issue template. This will help maintainers and contributors understand your issue quickly.

If you are requesting a feature spend some time to properly present your use case with some examples, current and expected outcome.

( What is SSCCE ? You can find template for Sequelize here )

A few good example of SSCCE

1. ResourceRequest timed out - connection not reestablished after db restarted #8014 (comment)
2. removeAttribute('id') results in undefined: null data value #7318 (comment)
3. toJSON converting booleans to "t" (true) or "f" (false) #8749 (comment)