PMID, PMCID fields for book chapters

iagogv

Book chapters may have PMID, PMCID, however, these are not included among them in Zotero. I'd like to ask again for allowing those items among middle pane columns (https://forums.zotero.org/discussion/130190/allow-to-include-new-item-fields-as-columns-in-main-middle-pane, https://github.com/zotero/zotero/pull/5831).

Thanks!