As long as this feature is not available, I have found a workaround that allows me to configure the icons for all tags in a tag group more quickly. I use Data Explorer to generate a string, which I then simply paste into the settings field of the component.
The query I use to generate the configuration:
--[params]
-- string :tag_group_name
-- string :icon
-- string :color
WITH selected_group AS (
SELECT id FROM tag_groups WHERE name = :tag_group_name
),
tag_ids AS (
SELECT tag_id
FROM tag_group_memberships
WHERE tag_group_id = (SELECT id FROM selected_group)
),
tag_names AS (
SELECT name
FROM tags
WHERE id IN (SELECT tag_id FROM tag_ids)
)
SELECT string_agg(name || ',' || :icon || ',' || :color, '|') AS tag_icon_config
FROM tag_names