No I do not believe you can do this today. Rule delegation is typically reserved for business facing rules. What is a scenario or use case that it would make sense for say a business analyst to modify an HTML rule?
Client requirement - user wants to update the disclaimer text below thru delegation, and this is mapped to eForm for letter generation. When we tried paragraph or correspondence rule, those foreign characters would appear to be broken in the letter (see attached). We found that when we used a HTML rule with Property-Set-HTML, those foreign characters appeared fine in the letter.
If not a HTML rule, any idea on how we can store the text below and delegate to end user?
My Organization complies with applicable federal civil rights laws and does not discriminate on the basis of race, color, national origin, age, disability, sex, sexual orientation or gender identity.
ATTENTION: If you don’t speak English, language assistance services, free of charge, are available to you. Call Member Service at the number on your ID Card (TTY: 711).
Spanish/Español: ATENCIÓN: Si habla español, tiene a su disposición servicios gratuitos de asistencia con el idioma. Llame al número de Servicio al Cliente que figura en su tarjeta de identificación (TTY: 711).
Portuguese/Português: ATENÇÃO: Se fala português, são-lhe disponibilizados gratuitamente serviços de assistência de idiomas. Telefone para os Serviços aos Membros, através do número no seu cartão ID (TTY: 711).
Yeah I would have gravitated toward an Paragraph rule, but it looks like you faced an issue with that approach. Seems like something is going wrong in the encoding that is worth pursuing since I don't think you'll be any more successful in delegating an HTML rule.