If you use the 5e Shaped character sheet on Roll20 with its companion script, this page will allow you to generate a supplementary script file that will load additional monsters and spells from the 5etools data set for use with the !shaped-import-monster and !shaped-import-spell commands. Select the sources that you wish to include, click the "Prepare JS" button and then, once the data has populated into the text box below, click the "Copy JS" button to copy it to the clipboard. You should then paste it into a new API script file in your Roll20 campaign. See the script documentation for more details on how to import spells and monsters into your game once you've loaded the additional data.
Important Note: Please do not paste links to this tool on public forums - especially not on the Roll20 forums.