Possible to import custom classes?

I want to create a character with this class or similar: <a href="https://www.5esrd.com/classes/3rd-party-publisher-classes/en-publishing/alchemist/" rel="nofollow">https://www.5esrd.com/classes/3rd-party-publisher-classes/en-publishing/alchemist/</a> . Im wondering if there is something I can load into my game/buy that will let me open up a character sheet, and choose the new class from some existing compendium or something I can copy paste from another site and access it in the OGL character sheet. Thanks!

Not really. For items not in a compendium, you need to input data manually. As I understand it, eventually, the new Charactermancer will allow you to quickly build characters from Compendium or PHB information, but it is still in beta testing, and will likely only allow you to add either SRD or purchased content. This is almost certainly necessary in order to secure licensing from game companies.