A few styles using the Citation Styles Language. The main difference with the ISO 690 styles available in the official repository, is that the styles here are multilingual (no attribute default-locale is set, see also https://docs.citationstyles.org/en/stable/specification.html#the-root-element-cs-style), so e.g. when using Zotero, the language can be chosen on creation of a bibliographic entry.
A note on the label styles (<category citation-format="label"/>) and Zotero: Zotero automatically generates a label (based on the creator and the date), but if you want to assign your own label, then put citation-label: replaceThisWithYourOwnLabel in the Extra field, see also https://www.zotero.org/support/kb/item_types_and_fields#citing_fields_from_extra and https://docs.citationstyles.org/en/stable/specification.html#standard-variables.