It's possible that the blocks in which the glow option is enabled (eg glowstone, sea lantern, lantern, magma block) can be edited the intensity of this light, as it is done in the case of other subcategories [animation] - [frametime], [interpolation] and [frames]? I mean some specific entry in the appropriate JSON file of such an animated block.
PS. In fact, this request should have [Request type - New feature/Upgrade], only for reasons unknown to me it is only possible to select [Error in the program].
This site is for bug reports only, for feature requests go to feedback.minecraft.net; also lights is handled by the server, resource packs only change the client.